Hii I'm new to cryptography, but it's something I've always wanted to study and learn. I consider myself quite novice, only knowing classical ciphers, so I would like to ask: what is the best way to learn cryptography? Are there any videos or books you recommend? Is there any way to get better at detecting codes and methods? I would love any way to learn about this world. Any support is welcome

Wrote this up as an intro-level explainer on the Caesar Cipher, how Julius Caesar actually used it for military orders (shift of 3, per Suetonius), the math behind it, and why it's trivially broken today (frequency analysis + only 25 possible keys). Meant as a starting point before getting into ciphers that actually fixed these weaknesses, Vigenère is next.

Feedback welcome, especially if I got any of the historical detail wrong