Someone help me, after unlocking the corrupt place where *explore* appears, how do I explore it because something appears that does not allow me to do so
I guess you mean the lake with the corrupt water...
If it's about the potions:
Explore until that something does not happen. If your character is fast enough you can escape from fights or use the bomb which is usually successful with most enemies.
If it's about the way:
Your player character needs a source of light. There are at least three items that do shed light. One of these can be made if you char has built a special room in the teachers hut, one will be given as a gift (depends on your choice in a quest) and one can be bought.
Tell me if you want me to be more explicit.
The bomb is the smoke bomb. It lets you leave the fight immediately and works on almost all foes.
The light sources are a torch, an amulet that the Lizard priestress gives your PC (not available if the witch helped with her light source) and an armor but it's only available way later than the other two.
To make a torch your PC needs to build the toolroom / workbench or so. I can't remember what it's called but it will be obvious when you check the screen that shows you what you can build to improve the teachers hut. To get there you need to click the tool icon in the main screen when your PC is in the hut. It has a hammer and another tool in it - there will be an area "Improvements" that shows you what can be built and what you need for building.