The most basic fingering area in Bassoon would be considered in the range from Low F at the bottom of the staff to Bb at the top of the staff.
There is also the whisper key. Shhhhhh. Actually it has nothing to do with whispering per se. It is the lower right key used by the left thumb. As you have noticed in fingering charts this key is to be held down for all notes from low F to the Ab at the top of the staff
Bb and F scales are a good place to start in learning bassoon fingerings
There are many resources to find out fingerings for Bassoon bot text based and web based:
- The Pearson Standard of Excellence is a must-have for all beginners in Bassoon
- http://www.wfg.woodwind.org/bassoon/ is a good site to find Bassoon fingerings on.
