There are no hidden features in krita.
For learning, I’d recommend this YT channel:
https://www.youtube.com/@BladeandQuill
or the official krita channel:
https://www.youtube.com/@KritaOrgPainting
or search on YouTube for “krita tutorial”.
A search on this forum will give this topic:
Krita-tip Video Series
and many others.
Hello @Michelist 