Learn math by yourself

How can I learn stuffs like Analysis, Differential Geometry by myself? I'm not a math major but I need it for my PhD career.
I have just started for a few weeks usiQAng Terry Tao's and Lee's books. However, for most of the times, I can't tell if my proof is right or wrong.
I posted in the SQT here but I rarely got an answer.
I guess going to an actual math class has its advantage after all. I have so many questions to ask but asking online is slow and unsatisfying. Every time an user answered, it just raised even more questions.
I feel complete lost.

Programming.

What.

just do it fgt

Programming help learning math? I just don't understand what you are trying to say.

Khanacademy.org

you're going to need someone who knows what he's doing to give you a hand to get you started

Tao's book is a great choice. Differential geometry is too far from you at this point. The first things you should learn well are Real Analyais (again, Tao's book is great) and linear algebra (I like Hoffman & Kunze for this)

I'm a math senior, you can ask me some questions here if you want, and I can give you a throwaway email as well if you're motivated and want to be able to ask me questions later on

download a ripped copy of a computer program named maple or at least google it and see if it would help you

Do you guys even know what analysis is?
> write proof
> check proof for logical inconsistencies
> check proof against ones on proofwiki/in your fucking analysis book
And if there's some lemma you used that others didn't ask specific questions on math stackexchange, math irc, or here on the /math/ board.

Link to your /sqt/ question?
Or rewrite it?