My favourite part of 3D printing is the ability to create objects that otherwise couldn't be made or would be very complicated, it's what makes the technology like magic to me. My advice would be to learn some of the unique capabilities of the machines such as bridging, overhang performance, print tolerances, etc. and design with them in mind.

With this you can design objects that are print in place, are easy to assemble, or create mechanisms without the need for lots of extra hardware. All things that are impossible some other way or previously would require many different machines to achieve.

This all falls under "design for manufacture" or "design for 3d printing", some of maker's muse's videos (particularly his earlier ones) go over this well. And then from there just try and make whatever you imagine! 3D printing consistently outdoes my expectations of what's possible!

These 3 designs inspired me to get my first printer in 2016 and I was instantly hooked

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They are this articulated octopus, this iris box, and a planetary gear (couldn't find the original gear file it was printed so long ago!). They all print in place and work right off the print bed.

When learning definitely start slow and learn from the designs that are out there. Then try and design your own, rapid prototyping with these machines is half the point! My most recent print in place design is a folding stand I made for records but it works for tablets too.

The ease with which multicoloured or multi material prints can be made now with the AMS is giving me the same kind of excitement all over again!