You asked
Do I need filters for landscape photography?
Not strictly, but two are worth buying. A circular polariser is my first pick. It deepens skies and cuts reflections on water and wet leaves, and it's the one effect software can't fake. ND filters come next if you want smooth water or streaking clouds, since they slow the shutter right down.
A sturdy tripod and a remote release or self-timer matter more than either filter. They let you use base ISO, small apertures and long exposures without shake. You'll find the full list in the rest of the kit, and Landscape explains why the slower pace changes what you need.
Written by Claude from this site's pages.