Good-Well | Commonly Confused Words

Good

/ɡʊd/

Something that is of high quality, satisfactory, or morally right

My friend Clare is a very good person.'Read it to me, that's the best way.The goods are gone, Fred, and there's an end of it.'

/wel/

A structure built above a hole in the ground to access water, or it can refer to being in a good condition.

I drank some cold water from a mountain well.These men need to be managed better!'You've lived longer than me, you know best.

Good is an adjective and describes a noun, indicating something that is positive or satisfactory.
Well is typically an adverb and modifies a verb, indicating the manner of doing something.
Remember: you feel good (adjective), but you perform well (adverb), since feeling is a state and performing is an action.
Another hint: If you are describing someones health, you would say they are well, not good', though colloquially both can be heard.
When used as an adjective, well can describe health, as in She is well.