Beginner

Start here if you've never written C++, or never finished a course. By the end you'll be compiling real programs from multiple source files, and you'll have built a command-line app that persists data to disk.

Lessons

#	Lesson	You'll learn
1	Setup & your first program	compiling vs running, main, std::cout, std::cin, compiler flags
2	Variables & data types	int double char bool std::string, auto, const, brace init
3	Numbers & math	integer division, %, overflow, casts, <cmath>, <random>
4	Strings	std::string, std::format, find/substr, std::string_view
5	Booleans & conditionals	comparisons, &&/\|\|/!, if/else, switch, ternary
6	Loops	for, range-for, while, do/while, break/continue
7	Arrays & vectors	std::vector, std::array, sorting, copying vs referencing
8	Maps & sets	std::map, std::unordered_map, std::set, structured bindings
9	Functions	pass by value / reference / const&, overloading, defaults, recursion
10	Headers, namespaces & multi-file programs	.hpp/.cpp, declarations vs definitions, linking, namespaces
11	Files & error handling	<fstream>, std::filesystem, exceptions, std::optional
12	Capstone: task tracker	put it all together in a real CLI app

How to work through it

• One lesson per sitting. Type every example. Compile with -Wall -Wextra. Do the exercises.
• Don't move on until the "Recap" all makes sense.
• Stuck? Re-read the "Common mistakes" section — your bug is probably there.

When you're done

You should be able to explain every line of the capstone and add a new feature to it unaided. Then go to Intermediate.