List of websites to learn Tamil Grammar:
3. Tamil Wikipedia grammar guide - Has relevant links, guides for understanding essential Tamil grammar.
4. http://ilakkanam.blogspot.com – A team blog in Tamil answering common questions / doubts on Tamil grammar.
7. Tamil grammar through English – A simple beginner level presentation in English to understand basic Tamil grammar.
8. http://www.pudhucherry.com/pages/gram2.html andhttp://www.pudhucherry.com/pages/gram3.html teach you about சந்தி இலக்கணம். i.e, when to add க், ச், த், ப் in between two words when you write them together. Guess this is the number one confusion for any tamil writer