Tick anything you already have, in any order. Quests unlock once this is done.
Cryptopals and CryptoHack are both free and both start from nothing. They teach by making you break real ciphers rather than read about them.
Open CryptoHack2 things left above. Quests are real things you go and do, so they only make sense once you have what you need.
First one waiting: Break a Caesar cipher by hand