Where's the best site to understand this topic? I need help and can only understand some parts of it.

For example for my homework given by my teacher I must simplify giving the answer with positive index:

a^2 b^3 / ab X a^2 b^5 /a^2 b^2

and another question:

a^1/4 X a^2/5 X a^-1/10

and questions like:

write 2^n X 8^n / 2^2n X 16 in the form 2^an+b

There's lots more like these then to the sketch graphs which want us to give equations of asymptopes and the axes intercepts etc. Transformations..

Any recommended website that teaches you this in detail?

Thanks.