If you want to actually implement an ACME client from first principles, reading the RFC (plus related RFCs for JOSE etc) is probably easier than you think. I did exactly that when I made a client for myself.

I also wrote up a digested description of the issuance flow here: https://www.arnavion.dev/blog/2019-06-01-how-does-acme-v2-wo... It's not a replacement for reading the RFCs, but it presents the information in the sequence that you would follow for issuance, so think of it like an index to the RFC sections.

Implementing an ACME client is part of the final lab assignment for MIT’s security class: https://css.csail.mit.edu/6.858/2023/labs/lab5.html

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