Recommendations for a YARA-L course or training

https://www.varonis.com/blog/yara-rules

https://www.signalscorps.com/blog/2022/sigma-rules-104-writing-detections-yara-l/

https://xtraining.kaspersky.com/

tryhackme has a yara room

https://tryhackme.com/room/yara

Heres a list of rules i've written up in Yara-L along with some more complex examples https://github.com/amalone341/YARA-L-Work . For learning how to write rules I cant recommend the new to Chronicle series enough. I'd start at the first post and read through from there https://chronicle.security/blog/?filters=new-to-chronicle-series .

Grrrreat!