Does anyone have notes/examples on how to properly right the standards (Best practices and code style)

[AlexCodeForge]

just as title says, i would like to see some examples
Should i keep this files short for LLM ? how much is too much ?

I tried building my own with my own workflow that looks looks like this

Find an issue/bug -> iterate over it until fixed-> create a file with clear notes on the lessons learned -> feed the standard documents based on this

Im not sure if this is actually a good approach but im doing my best, problem is now i see files going over 600+ lines (i may trim lot of that tho)

also noticed sometimes agent mode on cursor will ignore this standards at all , thats a problem on im facing too , any suggestions ?