how to read file from line x to the end of a file in bash

tail -n +2 file.csv

From the man page:

-n, --lines=N
     output the last N lines, instead of the last 10
...

If the first character of N (the number of bytes or lines)  is  a  '+',
print  beginning with the Nth item from the start of each file, other-
wise, print the last N items in the file.

In English this means that:

tail -n 100 prints the last 100 lines

tail -n +100 prints all lines starting from line 100