RE: How windy is too windy?
Fooseball-
Generally the wind is nothing to be worried about until it is strong enough to flip your plan on the ground, (or it is particularly gusty, )which may not be that much wind if you are flying a high wing trainer or plane with lots of dihedral.
There are full-scale techniques (slips and cross-controls, etc) you can use when landing to stay parallel to the runway, but with most trainer and sport planes you can do it the lazy man's way, just let the plane crab into the wind on final, using normal control inputs to keep it mostly parallel to the runway, and when it touches down straighten it out.
Keep your takeoffs and final approaches pointed into the wind as much as possible, even if you have to be a bit "cross runway" to make that happen.
Flying in the wind is great practice and IMHO a lot of fun once you get used to it. However, local conditions and obstacles will dictate what is safe for you and your plane, so if you are unsure, error on the side of caution.
Regards
Bob