Will the latest Bootstrap work properly with the default WordPress jQuery?

Yes – it works fine with BS4 – no conflicts, no issues.

Simple way to test is to install a vanilla WP 5.3.3, create a barebones theme with BS 4 and check the JS console for issues.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)