Hello! I hope this is not the wrong spot

Well, I never even had studied art or perspective geometry, so everytime it comes the time to challenge myself with buildings on isometry and different angle i got so lost and end to give up fastly.

I wonder if you might suggest anything about how to approac this stage.

Any tutorial or guide/manual which might help me to understand how and learn prospective from basis. Applied to isometric and similar..?

It would open a new world to me =)

Thank you!