How to move a Joomla site to another server?

Question

Joomla

From the old hosting, I copied all the files, and made a complete database dam. I uploaded the file on the new server, corrected the config for the new database, launched it, but the site works as if half of the modules do not work, although everything seems to be installed.
Tell me how to completely restore the site, in general terms, tell us how the plugins are arranged there, and what happens to them after the transfer, where to drop.
I had no business with Joomla before, it became necessary to transfer a simple site.