How to switch to Composer

Has anyone actually successfully switched to composer yet? I am trying this on a subdomain and it just constantly fails miserably.

I am using CentOS7 and MariaDB, v10.5.15, I have a fully functioning version of Plesk and still every time it just doesn’t work and ends up causing choas.

is there a video or walkthrough of someone actually doing this anywhere because I cannot find one anywhere.

Without knowing which errors you encounter, no one can help you.