1. Well [irregular adverb: comparative and superlative forms are: better and best] in a good or skilful or thorough way: The band played well. ·How well can you speak French? ·Mixed the ingredients well. [irregular adjective: comparative and superlative forms are: better and best]. You look well. [discourse marker] to signal a pause or change of direction inn the conversation: Well, let me think about it. …
Grammar patterns
How well do you know him?
The boys are well behaved.
Marc could well have left town by now.
Are you well?
We didn’t get home well after midnight.
Please let us know your plans well in advance

2. well
Collocations
Well is often qualified by the following words: very, quite, rather, fairly and pretty. He played that quite well, didn’t he?
Well combines with many past participles to form compound adjectives: well prepared, well paid, well built, well dressed, well off. You can tell by their fur coat that they are well off.
Well commonly add emphasis to these two adjectives: aware and worth: The pyramids are well worth visiting.

3. well
Set phrases
As well as = in addition to. Can I have a beer and a whiskey as well?
Do well to =be advised to. You’d do well to get a second opinion.
May/might (just) as well .. The bus is late. We may as well walk.
Well and truly =totally. I got well and truly soaked.
Just as well. (to say that something is convenient or helpful) It’s just as well we had a spare key, or we might have been locked out.