Landscapes?

[fokker]

Learn how to maximise sharpness out of your equipment. This includes using the tripod in its most stable configuration (ie not raising the centre post), using a remote shutter or self timer, mirror lockup, shoot at the sharpest aperture - usually f/8 - f/13, turn off IS while on the tripod.
Learn about focusing on the hyperfocal distance if you want the entire scene in focus.

Invest in a CPL filter and some graduated ND filters if you feel the need to buy more equipment.