Need to complete w-4 2020 form. Single claiming 0. How do I complete the form so I won't have to pay taxes at the end of the year?

[Critter-3]

https://www.irs.gov/individuals/tax-withholding-estimator

[Opus 17]

If you just follow the instructions, you should break even or get a small refund, unless there is something unusual about your situation.  The W-4 is 4 pages, with 3 pages of instructions, even though you only have to turn in the first page to your employer.

https://www.irs.gov/pub/irs-pdf/fw4.pdf