verstehen

to be skilled at sth., to know how to handle sth.

what you are skilled at — practical competence, not just knowing about the subject

Er versteht sich auf diesen Beruf.

He is skilled at this profession.

worauf?darauf

to get along with sb.

who you get along with — a relationship, not interpreting a word or knowing a field

Ich verstehe mich gut mit meiner Schwester.

I get along well with my sister.

womit?damit

to understand by sth.

what you take a word to mean — an interpretation

Was verstehst du unter der Freiheit?

What do you understand by freedom?

worunter?darunter

to know about sth.

what you know about — a field of knowledge

Er versteht viel von der Musik.

He knows a lot about music.

wovon?davon