Welcome back ja9g08;
Congrats on a successful build.
Have you had all your updates done? Drivers and OS?
Step-by-Step Guide to Building a PC
You're ready for Step 10: Test System and Have FUN!!
It mentions several tests to run and some software for system monitoring.
Don't forget that a gaming session is a pretty fair way to test the system too.
I use OCCT for most testing as it performs both testing and monitoring functions....then I can use the graphs to look over the results in detail. I like OCCT cause its 60 minute tests don't require the "overnight" time commitment of P95 and memtest .... of course once I have my OC dialed in, then I'm going to use P95 as the final test.