Very new to 3D printing

As the title says, I am very new to 3D printing. I believe I have my printer dialed in to where I can print some good designs without having to worry too much. I know I’m sure I can always dial it more, which I know I’ll be in here asking this awesome community for help here and there, but for the most part, I feel confident about trying to print practical things now.

My question for all of you guys is this:

What are some things that you have printed that that just made thing super convenient? Post links too! I have made an account on Thangs, Thingiverse, and GrabCAD. I want to grow my collections.

Also, I am printing with PETG, which from my understanding is more on the slightly difficult spectrum of filament to work with, so I don’t know if that make any difference with the designs that you guys may post.

Thanks in advanced!