It'll become a little bit difficult in terms of learning the next pair of antonyms.
多 have a variety of meanings, and is one of the most crucial words learners need to understand and keep practising in terms of speaking great Chinese.
Don't be afraid. You are learning advanced Chinese. Your parents will be proud of you. Keep this in mind, and let's go.
I just want to freak you out, but it is truly important.
Basically, 多 means "many/much."
e.g. I have a lot of money. - I have 很多 money. (很 means "very." I give this extra character to you, you ambitious guys!)
多 can also express degree, similar to the use of "how."
e.g. How long is it? - 多 long is it?
P.S. Please fully understand these two main usages. I mean, FULLY.