If you have medium hard or harder water with pH above 7, Corkscrew Vallisneria is good. Pygmy chain sword is a good plant for smaller (like 20g) tanks, whateer the water (soft or hard). These do well with moderate light. Stem plants require more lighting generally, though Brazilian Pennywort is an exception. Anubias and Java Fern attach to wood or rock (not planted in the substrate) and manage fine in low and moderate light. Floating plants are always easy and good for the water and the fish. Water Sprite is perfect, the Pennywort can also be floated and is quite attractive.
You will note that the names shaded, so you can click on them to see our profile with photos and information. There are other plants for moderate or low light, but these are less fussy which was your criteria.