You've learned Python's most flexible data structure. Lists store ordered collections with bracket syntax: items = [1, 2, 3]. Access elements by index (-based) or negative index from the end. Slice with [start:stop:step] for sublists.
Lists are mutable. Modify with index assignment, append(), extend(), insert(), remove(), pop(), and del. Sort with sort() or sorted(), reverse with reverse() or slicing. Find elements with index() and count(). Check membership with in.
Iterate with for loops and enumerate(). Build lists efficiently with comprehensions: [expr for item in iterable if condition]. Watch out for reference sharing when copying. Lists are everywhere in Python. You'll use these skills constantly.