Edit an existing .ttf font

I’m new with this software and I’m just trying the trial version.
I need to import/open an existing font and edit it in some parts, like change the default line-height or redesign some glyphs.
Is it possible to do that with Glyphs?
Thanks a lto to everyone!

Sorry, I need just to know how to augment the default line-height of a font (or if it is possible). Thank you.

It is not a good idea to open a TrueType font in a font editor just to change the line spacing. There are to many things that can’t be properly interpreted and written back to the file.
You would need to use a more specialized tool to do that. DTL OTMaster or TTX/fonttools can do that.