Hi Newimo,
are there specific AVM features you are looking for?
Here are some resources you might be interested in:
AVM V8 article: AVM 8 New Features | Algorand Developer Portal
AVM V7 article: AVM 7 New Features | Algorand Developer Portal
ARC-4 standards: ARCs/arc-0004.md at main · algorandfoundation/ARCs · GitHub
ARC-4 is the most up to date standard for Algorand smart contracts so do make sure you check it out!