Best practice to use jquery library like Data tables

I would like to know what is the best practice to include an additional jquery library like Data-tables. Also if I wanted to use additional custom javascript file, what would be the best way to link that

Version
versions’ =>
array (size=5)
‘current_header’ => string ‘1.29’ (length=4)
‘maintenance_release’ => string ‘17.1.20180720’ (length=13)
‘api’ => string ‘17.1.003’ (length=8)
‘phpgwapi’ => string ‘17.1.003’ (length=8)
‘header’ => string ‘1.29’ (length=4

Maria db is ued
lighttpd server is used
PHP version is 7.2
installation type : archive instalation