I had the opportunity to pick up a nice little 17-inch Samsung SyncMaster CRT monitor a while ago, which I bought ...
Video adapters like this one are not hard to use ... one for your modern monitor and the other GPU for your CRT monitor.
Unless it’s a genuine Apple-approved CRT with the proprietary DA-15-based video connector, you are going to need at least an adapter studded with DIP switches to connect it to other monitors.