A website with proof techniques or math methods is Tricki.org.

Tricki website

Wiki on Timothy Gowers role in Tricki

Tricki.org is a Wikipedia-style project collecting methods of mathematical problem solving conceived in 2008 and launched by Gowers, Olof Sisask and Alex Frolkin in March 2009.^{[8]} Terence Tao and Ben Green are among those to have contributed articles.^{[9]}

Timothy Gowers announcement Tricki fully live

Terry Tao announcement on Tricki now live.

Timothy Gowers 2010 on whether the Tricki is dead?

It appears to have a little activity in 2012 and before that in 2011.

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About New Math Done Right

Author of Pre-Algebra New Math Done Right Peano Axioms. A below college level self study book on the Peano Axioms and proofs of the associative and commutative laws of addition.
President of Mathematical Finance Company. Provides economic scenario generators to financial institutions.