Finally, a post I can really get into.
So, the one-size-fits-all answer is photo prints of landscapes. New York skyline, nearest natural feature, Amazon rainforest, what have you. Pick by vague interest or colour tone. Look online for source images and get printed/framed. Very inexpensive.
Next step would be photos of the local area if you live in a mildly photogenic place. There will be local photographers near you, look them up. Prices will vary.
After that, animals are usually pretty good crowd pleasers. Especially exotics like tigers, weird birds, etc. sourcing is same as step one.
Last step is just to develop some artistic sensibility by blind luck. Either buy a coffee table book on art, or go to a gallery's website, and scroll around. Make notes on what your gut likes. Look into the artists and their genre/movement. Grab some prints.
Things to avoid:
* Clowns
* Nudes (at least be 100% before selecting)
* Portraits of yourself
* Obvious AI slip (you WILL get into arguments about it)
* Unsourced art (sooner or later someone will ask why you've hung one of Hitler's paintings and you will be caught out)

>>3012911
>Things to avoid:
>* Clowns
>* Nudes (at least be 100% before selecting)
>* Portraits of yourself

The picture of me posing naked in clown makeup stays on the wall I don't give a fuck what you say!

>>3012899
Let me give you a super short interior design 101 for someone with 0 inherent understanding:
You want to pay attention to materials, plants, light and decorations.
Materials is for the type of furniture. If you can stick to "basic" materials, so wood, stone, metal. No obvious plastic for example.

For lights really you only need two rules: Many small lights are better than one big light and warm LEDs are better than cold ones. A room with 4 smaller lights (reading light next to sofa, sunset lamp aimed at ceiling, corner light next to plant, desklamp on desk) will look much more cozy than a single, central lamp. Indirect lighting also work really well.

For plants you'll want low maintenance and the core issue is going to be light, so get plants from the Araceae family. Monstera, Philodentron, peace lily.

For your question on walls: If you have interest, then stuff related to those is best. If you don't you want to stay neutral. Abstract paintings are nice because they can give a lot of color while being fairly inoffensive. Landscapes are a close second for generic yet acceptable. Think windows screensaver tier stuff: Beaches, Forests, Hills.
A little more personality would be adding stuff you're interested in but more stylized. Herbarium drawings for plant enjoyers for example. Ideally stay away from too much pop culture, it ages poorly and generally screams "basic". If you must, then get something more stylized or abstract. Most franchises have more abstract posters for example.
You can also go into a thrift store, they often have random oil paintings and such. Most will be hideous but you find the occasional gem.
Anything you can have direct relationship to is better though. If you've been to a random city outside your country for a vacation you liked, get a poster relating to it. Anything that has a story basically.

Lastly there is never ever any excuse for just hanging a poster on the wall as-is, you always want a frame, even if it's a subtle one.

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Why not cloons?

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google Big Wall Decor. Upload this image. Order a 70inx40in print of it. Decorating complete.

>>3012899
Giant ornately framed oil painting of a fully rigged sailing ship.

>>3012911
>Portraits of yourself
Ooh that's a good idea I need to put my suit on and take a photo and get it printed off to hang on the wall