Beginner - First Firearm Anything i should know about

Hello All,

Im 34 y/o M, and just purchased my first firearm, for self defense and safety.

Honestly was looking for a Glock G19, as i heard it was beginner friendly, but CA has apparently made these impossible to get. The clerk at the local shop tried pushing a few different handguns, but i heard SIG was best when it comes to aftermarket equipment and support.

Anything i should know? Any additional purchases you think are necessary?

I believe id want a sight and a flashlight.

I dont need anything too fancy, as i don't imagine taking it out too much.

Appreciate any tips, advice, recommended products etc.

Link below is the exact model i got.

https://www.capfirearms.com/handguns/semi-automatic-handguns/sig-p320xf-9mm-10r-ns-ms-ca798681699247