what do you do when you have 4 checkbox, and want the maximum of tick able check box to be only 2 out of the 4

Answer 1

https://stackoverflow.com/questions/19001844/how-to-limit-the-number-of-selected-checkboxes

Answer 2

This is a good source, if you want it done in pure js https://roytuts.com/limit-number-of-checkbox-selections-using-javascript/