How to add scripts to Joomla correctly? After transferring scripts, a bunch of errors fall out?

Question

JavaScript

Somehow they developed a map for Bitrix and now it became necessary to transfer the same map to a site under Joomla, after the transfer there was a problem with the fact that all connected scripts (if I understand the cause of the error correctly) are loaded before html ?? Since scripts do not see selectors in any + jquery works in the same way. Plz tell me which way to dig in order to understand how to make the scripts work
Source :
https://interma.ru/where-buy/

Answer 1

Joomla is still that rubbish ... I solved problems with inserting scripts in it with the help of add. module - flexi custom code, it seems that's what it was called. If you do not google, I can give the archive.