Colby College
Spanish Language & Culture: #1 "Por" or "Para"
This paragraph provides excellent examples of the varied uses of the prepositions "por" and "para". Pass the cursor over the highlighted preposition to get an explanation of its use.
Lingolex
Lingolex.com: Free Resources for Learning Spanish
A complete guide to Spanish which contains mostly lists of vocabulary words and phrases covering topics such as Christmas vocabulary, adjectives that describe personality, prepositions of location, common proverbs and more.