Welcome Emma_Spears.
Please share the set up(s) you have now? Size and /or kind, lights and filters if they have them.
Plants for beginning would be lower light and easy care like Java Fern, Anubias Nana "Petite", Cryptocoryne aka Crypts, like Green and Bronze, C. Parva.
Java Fern and Anubias are plants you tie to a rock or DW. The rhizome cannot be planted because it will likely rot. The roots can grow into the soil or attach to stones and DW.