What does it mean to invite someone over on your homepage?

i don't quite understand how that works .Is it best to follow others or have them follow you ? also,Do you think I need to se...

Because every time I get an alert saying that and I click it, it just takes me to the main page.

when I loook at my advice, under some of my answers it says 100% what does it mean?

Why wont it let you know when someone post comments???

if you block someone does that mean they can not see your pictures or cant see anything of yours or what??

How do you add someone to your group ?

Is it possible to rate someone's answer that your blocked by?

I mean why are the points we get if someone likes our answer different?

So sometimes I add people it will say.. bla bla this person with have to aprove you bla blah, but sometimes it says I am now...

can one of the advisors please fix my homepage? it wont let let me put pics on.