How do I play the ornaments?

[Happy girl]

Can anyone explain how these Mordents/Trills are played in the right context to the piece please?

 

[simonking]

You mean the squiggles (upper mordents) above the G's in the second line? A quick move from G up to A and back to G at the start of the note, all quicker that a demisemiquaver in this piece, though baroque ornamentation is very much down to personal interpretation.

 

[Happy girl]

Thank you simonking.

This ornament is puzzling because it goes over two notes. I can’t get my head around it.

 

[Glenn]

It's probably on the G.
So as simple as G,A,G leading to the F.