stil m a li'l bit cnfusd dat where 2 use at and where to use on,will u plz  xplain dis 2 me so dat i cn cmpletly undrstand dis

At has got various usages with different meanings. Few of them are described here:

• used to say where something or somebody is, or where something happens. Instance, I met her at the stadium, I'll be at home, etc.

• used to say when something happens. Instance, We will reach at 8pm.

• Used to show a rate, speed, etc. Instance, at 70kmph, etc.

• used after a verb to show that somebody is trying to do something, or partly doing something, but does not succeed or complete it. Instance, She nibbled at the burger, etc.

On has got various usages with different meanings. Few of them are described here:

• in or into a position covering or forming part of a space. Instance, There is a book kept on the table.

• Supported by something or somebody. Instance, she was standing on one foot.

• At or near a place. Instance, a town on the beach, etc.