Real plants. Stick to low tech/low demand plants. Java fern, java moss, anubias, amazon swords, crypts, moss balls are all easy plants to keep without specialist lights or substrates. They will benefit from better lighting and fertiliser in the form of liquid ferts and root tabs for rooted plants, but they arent essential.
For minimal extra work and knowledge they give huge benefits.
Video link going through some low tech plants.
https://youtu.be/DpOVZEhBQ2c
The channel also did a great low tech planted tank project, although they did go into planted substrates and specialist lighting which you dont need.
Main thing to have some knowledge of is cycling a tank. Not knowing about the nitrogen cycle or how to cycle a tank is probably the #1 issue for beginners.