Beginner

Start here if you've never written Swift, or never finished a course. By the end you'll be running real programs from SwiftPM packages, and you'll have built a command-line app that persists data to disk.

Lessons

#	Lesson	You'll learn
1	Setup & your first program	installing Swift, swift run, print, readLine, SwiftPM basics
2	Constants, variables & types	let vs var, type inference, Int Double String Bool, tuples, explicit conversion
3	Numbers & math	integer division, %, overflow traps, &+, floating point, Foundation math, random
4	Strings & characters	Unicode strings, interpolation, String.Index, Substring, raw & multi-line literals
5	Booleans & conditionals	comparisons, &&/\|\|/!, if and switch (as expressions), ranges, guard
6	Loops	for-in, ranges, stride, while, repeat-while, labels, enumerated()
7	Arrays	creating, indexing, slicing, map/filter/reduce, sorting, value semantics
8	Dictionaries & sets	key lookup, counting idiom, grouping, set algebra, Hashable
9	Functions	argument labels, defaults, tuples, variadics, inout, functions as values, recursion
10	Optionals	if let, guard let, ??, optional chaining, map, why ! is dangerous
11	Files & error handling	throws, try/catch, defer, FileManager, URL, command-line arguments
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. 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.