Can anyone tell me about the shortcuts in maths.may be websites related to that is enough

I don't know what level of math you're wanting to shortcut.
And I don't know any shortcuts to math.

We learn math to avoid doing arithmetic.
Do you know what I mean?

Repetition is critical to reinforce any particular application of math.

a) Learn the Abacus
b) Read some books by Shakuntala Devi - Shakuntala Devi - Wikipedia, the free encyclopedia