1. Pronoun

   here; this place

   Usually written using kana alonesee そこsee あそこsee どこ

   ここに手のないナベがある。

2. this point; here; now

   Usually written using kana alone

3. these past ... (e.g. three years); these last ...

   Usually written using kana alonefollowed by a duration noun

4. the next ... (e.g. few days); these next ...

   Usually written using kana alonefollowed by a duration noun

Also written 此所【ここ】koko、是【ここ】koko、茲【ここ】koko、爰【ここ】koko