I try to explain the stuff that influences the quality of your images. File formats, compression, sensor size. Each solution has pro and cons – you have to decide what you need and want.
All the file formats are explained at Wikipedia.
Some stuff about sensor sizes. Quite old but still true.
And this are some of the guys with the big sensors.
01:05 Digital camera sensor size
06:56 Colour Depth
13:29 File Formats
14:18 Which file format to use
21:07 The End