how much knowledge of computers is required for freelancing

See there are different Freelancing job opportunities. So every opportunity needs there own way of computer literacy. For example, if you need to do a freelance in Data Entry, then you need to know the MS-Excel in a very detailed way. Similarly, if you want to do the freelancing work in Data Analysis then you need to know the software of R, Python, Ruby etc.

So depending on the opportunity you are looking for, the computer knowledge will be required.

** For a more detailed and specific answer, regarding the freelancing opportunities of your interest, please repost the question with the freelancing type, you need to know.

I hope this helps. Wish you a great eve!