This page provides common alternate fingerings.
The first fingering is standard. The second fingering should be used when you approach B natural from any note below B. It can also be used for trills.
The first fingering is standard. The second fingering should be used when you approach F# from any note that includes the pointer finger in the right hand. It can also be used for trills.
The first fingering is standard. The second fingering should be used when playing chromatically. It can also be used for trills.
The first fingering is standard. The second fingering should be used when playing chromatically. It can also be used for trills.
The first fingering is standard. The second fingerings works well when you need to quickly move to or from the adjacent F natural.
The first fingering is standard. The second fingering is useful if you need to cleanly and quickly slur between throat tone Bb and this C.
There are many more alternate fingerings. Alternative fingerings are gone over in detail at this link. Remember that these fingerings are intended to make playing the clarinet easier. Getting the best musical result is always the goal. Let your musicianship be the guide.