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🎁 100% Free — No Card RequiredWatch full, unlocked lessons from real production-grade courses before you commit to anything. See the teaching style, the depth, and the hands-on code — then decide if the full course is right for you.
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122Free Lessons
42Courses
9Learning Paths
🤖 AI, Data & Machine Learning
14 free lessons across 4 courses
AI & Machine Learning
4 courses
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
Backend Engineering
3 courses
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
Developer Tools & Workflow
1 course
DevOps & Cloud Infrastructure
3 courses
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
Frontend Development
2 courses
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
Programming Languages
2 courses
System Design
3 courses
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
Testing & Quality Engineering
2 courses
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
Databases
1 course
Lesson 1: From Project Setup to Production-Style API
FREE
Trial Lesson : Documentation Finalization - Making Your System Maintainable
FREE
Trial Lesson : Database Schema Design - Building the Foundation of Your Quiz Platform
FREE
Trial Lesson Building Your First Production-Ready Microservices Architecture
FREE
📚 Substack Course Publications
4 free lessons across 1 courses
Data Structures & Algorithms
1 course
🌐 Role-Based Web Development
5 free lessons across 2 courses
Backend Engineering
2 courses
Frontend Development
2 courses
System Design
2 courses
Developer Tools & Workflow
1 course
DevOps & Cloud Infrastructure
1 course
Programming Languages
1 course
💻 Programming Languages
17 free lessons across 6 courses
Backend Engineering
5 courses
Day 1: Setting Up for Success
FREE
Day 3: Operators and Expressions - Arithmetic, Comparison, Logical Operators (Understanding Operator Precedence for Clarity)
FREE
Day 2: Hello, World! (But with proper comments and docstrings) - Variables, Basic Data Types (Integers, Floats, Booleans) and Meaningful Naming Conventions
FREE
Data Structures & Algorithms
1 course
Day 1: Setting Up for Success
FREE
Day 3: Operators and Expressions - Arithmetic, Comparison, Logical Operators (Understanding Operator Precedence for Clarity)
FREE
Day 2: Hello, World! (But with proper comments and docstrings) - Variables, Basic Data Types (Integers, Floats, Booleans) and Meaningful Naming Conventions
FREE
Programming Languages
6 courses
Day 1: Setting Up for Success
FREE
Day 3: Operators and Expressions - Arithmetic, Comparison, Logical Operators (Understanding Operator Precedence for Clarity)
FREE
Day 2: Hello, World! (But with proper comments and docstrings) - Variables, Basic Data Types (Integers, Floats, Booleans) and Meaningful Naming Conventions
FREE
System Design
6 courses
Day 1: Setting Up for Success
FREE
Day 3: Operators and Expressions - Arithmetic, Comparison, Logical Operators (Understanding Operator Precedence for Clarity)
FREE
Day 2: Hello, World! (But with proper comments and docstrings) - Variables, Basic Data Types (Integers, Floats, Booleans) and Meaningful Naming Conventions
FREE
Testing & Quality Engineering
4 courses
Day 1: Setting Up for Success
FREE
Day 3: Operators and Expressions - Arithmetic, Comparison, Logical Operators (Understanding Operator Precedence for Clarity)
FREE
Day 2: Hello, World! (But with proper comments and docstrings) - Variables, Basic Data Types (Integers, Floats, Booleans) and Meaningful Naming Conventions
FREE
Databases
2 courses
DevOps & Cloud Infrastructure
3 courses
☁️ DevOps, Cloud & Infrastructure
12 free lessons across 4 courses
Databases
2 courses
DevOps & Cloud Infrastructure
4 courses
System Design
4 courses
Backend Engineering
2 courses
Frontend Development
1 course
Programming Languages
1 course
Testing & Quality Engineering
1 course
📱 Mobile & Game Development
3 free lessons across 1 courses
Backend Engineering
1 course
Frontend Development
1 course
Programming Languages
1 course
🔧 Frameworks & Libraries
3 free lessons across 1 courses
Backend Engineering
1 course
Databases
1 course
DevOps & Cloud Infrastructure
1 course
🎓 CS & Specialized Skills
10 free lessons across 3 courses
AI & Machine Learning
1 course
DevOps & Cloud Infrastructure
3 courses
System Design
3 courses
Backend Engineering
2 courses
Data Structures & Algorithms
1 course
Databases
1 course
Testing & Quality Engineering
1 course
📚 Other Courses
54 free lessons across 20 courses
Data Structures & Algorithms
6 courses
Day 3: Build a Prefix Search Trie over Sorted Relics — and Track the Pointer-Chasing Memory Overhead
FREE
Day 2: Sort Multi-Gigabyte Crawl Logs on Disk — and Avoid Memory Exhaustion with External Merge Sort
FREE
Day 1: Pack Web Metadata into a Contiguous Byte Array — and Measure the Cost of Cache Misses
FREE
Day 2: Style the Data Grid with Flexbox & CSS Custom Properties: and Watch the Layout Break on Small Screens
FREE
Day 3: Fetch Real-Time System Metrics from a Mock API — and Observe the Network Waterfall Delaying Content
FREE
Day 1: Construct the Basic Dashboard Layout with Semantic HTML — and See How Screen Readers Interpret Missing Structure
FREE
Backend Engineering
11 courses
Day 2: Style the Data Grid with Flexbox & CSS Custom Properties: and Watch the Layout Break on Small Screens
FREE
Day 3: Fetch Real-Time System Metrics from a Mock API — and Observe the Network Waterfall Delaying Content
FREE
Day 1: Construct the Basic Dashboard Layout with Semantic HTML — and See How Screen Readers Interpret Missing Structure
FREE
System Design
13 courses
Testing & Quality Engineering
4 courses
Day 2: Style the Data Grid with Flexbox & CSS Custom Properties: and Watch the Layout Break on Small Screens
FREE
Day 3: Fetch Real-Time System Metrics from a Mock API — and Observe the Network Waterfall Delaying Content
FREE
Day 1: Construct the Basic Dashboard Layout with Semantic HTML — and See How Screen Readers Interpret Missing Structure
FREE
Databases
9 courses
Developer Tools & Workflow
2 courses
DevOps & Cloud Infrastructure
5 courses
Day 2: Style the Data Grid with Flexbox & CSS Custom Properties: and Watch the Layout Break on Small Screens
FREE
Day 3: Fetch Real-Time System Metrics from a Mock API — and Observe the Network Waterfall Delaying Content
FREE
Day 1: Construct the Basic Dashboard Layout with Semantic HTML — and See How Screen Readers Interpret Missing Structure
FREE
Frontend Development
5 courses
Day 2: Style the Data Grid with Flexbox & CSS Custom Properties: and Watch the Layout Break on Small Screens
FREE
Day 3: Fetch Real-Time System Metrics from a Mock API — and Observe the Network Waterfall Delaying Content
FREE
Day 1: Construct the Basic Dashboard Layout with Semantic HTML — and See How Screen Readers Interpret Missing Structure
FREE
AI & Machine Learning
6 courses
Programming Languages
8 courses
Frequently Asked Questions
What are trial lessons?
Trial lessons are full, unlocked lessons hand-picked from real production-grade courses — covering System Design, AI & Machine Learning, Backend Engineering, DevOps & Cloud Infrastructure, Frontend Development, Databases, Data Structures & Algorithms, Programming Languages, Testing, and Developer Tools. You watch the same lesson a paying subscriber sees, with no edits or cut-downs.
Are trial lessons really free, and do I need a credit card?
Yes. Every lesson on this page is 100% free with no credit card, no trial timer, and no signup commitment. You can watch as many free lessons as you like before deciding whether to subscribe.
How are the free lessons organized?
Free lessons are grouped by learning path (career track) in the sidebar, then by topic category, then by course — so you can quickly find free coding lessons in the exact area you care about, whether that is AI/ML, system design, DevOps, or programming languages.
What happens after I finish the free trial lessons?
If a course clicks for you, you can subscribe to unlock every remaining lesson, source code, and certification for that course and the rest of the catalog — the "Unlock the Full Course" button above takes you straight to pricing.