Ignore rare, difficult roots. But don't miss common and easy ones.
Here is just a demo to show how much you stand to gain if you pay a little attention.
Forma, a form, shape
conform, formulate, formal, formally, formalize,
informal, uniform, formation, deformed, reform.
vid/vis, see
vision, envision, visual, visualize, visually,
television, video, televise,
evident, vivid, invisible.
Geo, the earth
geomancer, geology, geography, geometry,
geopolitics, geothermal.