Which focus points to use?

[cpinch73]

I have a canon 7D after upgrading from a 400D.

I was just wondering if anyone could help me with which focusing modes are used for which style of photo I.e. Portrait, landscape, motorsport etc? I really don't want to keep using the auto 19 point and want to advance.

Any help would be much appreciated.

 

[cpinch73]

What if your taking a pic with a big crowd of people though?

 

[cpinch73]

Thanks guys