How to add personal notes to the Anking cards without disturbing AnkiHub sync

The field is called additional resources, it is here:

Nothing will get suggested unless you click suggest a change so you don’t have to worry about other people seeing them. Only maintainers can accept / reject suggestions so even if you were to accidentally suggest a change it wouldn’t go through

Correct, but the lecture notes field is protected by default so you can add things there and they will never disappear

You cannot currently add a field as it will mess up the ankihub sync, if you want to do this for certain cards, you can make that change you want then protect that card specifically.

You can see how to do this here: 🔐 Protecting Fields and Tags

I do this sometimes when I keep getting a card wrong, so I would add a hint or move things around, but protect that individual card so it doesn’t get overwritten

You can do this here: How do I auto-open certain fields?

Let me know if you have any other questions!