Saving high quality photos

I was wondering what file type is best to store things. That too with such a high quality? (In photoshop)

Just photoshop file :P
Uncompressed or RAW. And the latter mainly in photos from a digital camera. PSD is also lossless.

Depends 100% on what you want to do. If you just want to keep for later to re-edit, then best save your file as .PSD (Photoshop Document).

PNG is a top quality to export.
Bitmap can be more colors than PNG, but not very useful.
It depends on what you want to do.