There are four types of yanderes:

Manipulative:
Focuses on working a series of situations to prevent losing their love.

Isolating:
Through any means makes it so they're the only one their love will be around.

Submissive:
Have all the love towards one person and will carry out any act asked of them.

Eliminating:
The major one everyone thinks about. Will attack rivals, or even their crush, if pushed too far.