📄️ Strings and Slicing
Indexing, the three-part slice, immutability, and the string methods worth knowing.
📄️ Lists
The mutable sequence — methods that change it in place, sort vs sorted, the reference trap, and comprehensions.
📄️ Tuples
The immutable sequence — the trailing-comma rule, shallow immutability, unpacking, and when a tuple beats a list.
📄️ Dictionaries and Sets
Key/value lookup with dict, uniqueness and set algebra with set, and why keys must be immutable.