Check out example codes for "google sheets remove first character". It will help you in understanding the concepts better.

Code Example 1

Using the RIGHT Formula
=RIGHT(A2, LEN(A2)-1)

Using the MID Formula
=MID(A2,2,LEN(A2)-1)

Using the REPLACE Formula
=REPLACE(A2,1,1,"")

Learn ReactJs, React Native from akashmittal.com