日文:どこ、ここ、そこ、あそこ。。。

どこ(where)、ここ(here)、そこ(there)、あそこ(far away place)　只可用於地方
どちら(what direction)、こちら(this direction)、そちら(that direction)、あちら(very far direction)　只可用於方向

Good afternoon,

Can you read explanation in English?

どこ　Where
ここ　Here　
そこ　There（Your place)
あそこ　There（Outside the two persons' area）

Yes, it is true that these expressions can only be used in indicating places.

If you wish to express, "xx is here", you can say
ｘｘさんはここにいます。

Even if you hear people say orally,
ここです。
（I'm）here.
It doesn't mean that ここ becomes the substitute expression of the person. That is, it is not indicating a person.

どちら　
こちら
そちら
あちら

It is true that they can be used to indicate directions, places or people.

For example:
すみませんが、どちら様でしょうか？
Excuse me, who are you?

This is indicating a person.

Please note that these expressions are polite forms.