"Withholding from other sources of income" - Other sources of income would be like taking distributions from an IRA or retirement plan, or getting interest and dividends from investments.
If you look at the i in a circle on the IRS Tax Withholding Estimator on the line that says "Other sources of income", you'll see "You can receive other taxable income, including in the form of distributions from an IRA, scholarships, and alimony from pre-2019 divorce decrees." There are many such examples, too many to list here.
"Enter the amount of estimated tax payments you made to date this year" - this would be any payments with form 1040-ES. It is unlikely that you need to make estimated tax payments since you have two jobs that can do withholding on your paychecks.
"Or if those options are for something else besides the taxes being withheld from my paychecks . " These are for something else. They are for sources of income that do not have withholding.
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