Examples to print
Easy to print
Many things are easy to print and you might want to start with them.
First, they should not be supertiny or large. Maybe 2cm by 2cm or a calibrating object, your printer often comes with a prepared object.
A calibration object will also show the strengths and weaknesses of your printer.
Harder to print
Very flat things, pointy things and things with more than one part can be harder to print.
Please also note that the larger the object gets, the longer the printing time is (no, a twice-as-large object does not take double the time) and the longer the time, the more can go wrong.
So an object could be easiy if it is small and hard if it is large.
If you use one from a plaform for 3D models you will sometimes find information that will help you figure out whether an object is easy to print or not.
Thumb rule: would it work if I would build it out of clay?
So keep walls thicker than 2 mm and place it cleverly to avoid overhangs you need to remove.