in the docs it was written as follows:-

If you wish to use $ for temporary variables, you have to prevent the expansion of variable names or your temporaries will be expanded. However, using $ is not recommended.



but preventing expansion of variable names or temporaries would be expanded means ???




-thankYou.

Expansion means resolving the value of the variable

So
unexpanded: $F
expanded (e.g.): 1001

unexpanded: $HIP
expanded: /path/to/hip/folder

etc…