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3D printing is generally pretty easy these days. Most of the difficult things from the early days have been largely automated through the use of numerous sensors and firmware improvements, as well as better engineering and materials being used to make the printers.

That said, some things are paramount.

Most filaments absorb water (hygroscopic), and need to be properly dried before use. A quick search should make a lot of resources come up.

The printing surface should be kept clean at all times. Keep a spray bottle of isopropanol and a cloth handy. Wipe the bed after each print.

Calibrate your filaments. Grab Orca Slicer and go through the calibration procedures. Save the profile with the brand and material in the name. Some filaments will diverge depending on colour as well, so if you start seeing different results it’s worth it re-calibrating for the new colour - save it as a new profile.

Most of all, have fun! Experiment, ask as many questions as you have. Don’t be shy. Sometimes what may seem like a stupid one is actually very important and non-obvious.