Messed up frames will RUIN your day. Here's how I make mine.

What you need:
Tools: Mitre saw, Orbital Sander, Router with 1/4" roundover bit, Drill, Kreg jig, helps to make yourself a frame jig like you'll see in this video.

Supplies: (4) 1"x 3" common boards for each set of boards (2 boards)
Lots of 1 1/4" drywall screws or 1 1/4" Kreg screws
Wood glue

Buy some of these items here:

Kreg K-4 Jig:
https://amzn.to/3iCDoTI

Kreg 1 1/4" Screws:
https://amzn.to/3eiFqVW

Framing Brackets:
https://amzn.to/3ekyGGX

Glu Bot:
https://amzn.to/38O9tUj

Clamps:
https://amzn.to/3fy5SMJ

24" Clamps:
https://amzn.to/3emgNr4

Enjoy!

Comment if you have questions.