Offsets and fillets

hi guys.
i use rhino for many years, since V2 (im old)
its rhino is the best but i have some issues in general

i hope you guys could step up some issues that have been problematic all along:
*offset (all range of commands especially on surface
*fillets (variable, surfaces solids… )

i always find it hard and im sure more will agree with me.
thnx for listening