How do I...

look how many polygons my object contains?
Thank you for answering.

To the right of the menu bar, in the top right of the screen.
In edit mode, shows for current mesh (both selected and total)
In object mode, shows for all meshes.

BTW: next time you might want to try a more descriptive title than “How do I…”
Something like “Counting polies” or something would be good.
Incidentally, searching for “Counting polies” in Blender General gives a number of useful results.

What am I supposed to look at; Ve:xxxx or Fa:xxxx?

Ve is Verticies and Fa is Faces

I will make a better title next time.
I didn’t know what to search on, thats why I didn’t found anything.

Thank you for your help!