Crystal
Course Index
28 Lessons · 3 Sections
Master Crystal — Ruby-like syntax compiled to native binaries at C-level performance. Covers fibers, channels, Kemal, Jennifer ORM, C bindings & Crystal 1.x 2026. Includes 4 builds: REST API with Kemal, CLI tool, Lucky web app & Ruby vs Crystal benchmark.
28Lessons
3Sections
4Projects
FreeAccess
Section 1Crystal FundamentalsLessons 1–10
Lesson 1
What is Crystal? Ruby-Like Compiled Language
Lesson 2
Crystal Setup: Install & shards
Lesson 3
Crystal Basics: Variables, Types & Operators
Lesson 4
Control Flow & Blocks in Crystal
Lesson 5
Methods & Closures
Lesson 6
Classes, Structs & Modules
Lesson 7
Crystal Type System & Generics
Lesson 8
Concurrency: Fibers & Channels
Lesson 9
Error Handling: Exceptions & Nil Safety
Lesson 10
Macros in Crystal
Section 2Web, C Bindings & ProductionLessons 11–22
Lesson 11
Crystal Standard Library Deep Dive
Lesson 12
HTTP::Server & Web in Crystal
Lesson 13
Lucky Framework: Web Development
Lesson 14
Kemal: Sinatra-Like Web Framework
Lesson 15
Database Access with Jennifer ORM
Lesson 16
Testing in Crystal: Spec
Lesson 17
C Bindings in Crystal
Lesson 18
Crystal Performance Benchmarks vs Ruby & Go
Lesson 19
Crystal CLI Tools: OptionParser
Lesson 20
Crystal Shards: Package Management
Lesson 21
Crystal vs Rust vs Go for Systems 2026
Lesson 22
Crystal in 2026: 1.x Stability & Ecosystem
Section 3Anti-Patterns, Best Practices & ProjectsLessons 23–28