W2 & W4 - ENGAGE CPAs

Form W-2 is known as a Wage and Tax Statement. It is the document that is delivered to each employee that earned more than $600 from a business in a given calendar year. A W-2 is distributed to employees that had federal, social security, and medicare taxes withheld on their paychecks NOT subcontractors who earned their total gross pay without taxes withheld. Subcontractors receive a 1099-NEC.
The W-2 will show the IRS how much you earned during the year (box 1), and how much you've paid towards your federal income tax (box 2). Depending on where you live it will also have information about state and local tax withholdings.
Form W-4 is related to the W-2 because it's usually the first thing you fill out before you get any paychecks from that company. The company paying you understands that this job might not be your only revenue stream, so it will ask you other questions about your tax situation, with the goal of knowing approximately how much in federal tax to withhold on each paycheck that you receive, so that you don't owe tax at year-end and no refund will be due to you when you file your tax return.
If you have too much withheld on every paycheck, you will get a refund when you file your taxes and you should consider adjusting your W-4 so that you have the correct amount withheld.
If you own money when you file your tax return, you likely didn't have enough withholding on each paycheck, so you should consider adjusting your W-4 so that you have the correct amount withheld. That will mean less money in your pocket every two weeks, but at least you can't spend it if you're sending the tax money right to the IRS.
The W-4 has become more confusing since the tax law changed in 2018, however, know that you can always adjust your federal withholding in fixed dollar increments as well. So if you're making $1,500 every other week and you only have 5% withheld ($75), you can tell your payroll/HR to increase your federal withholding by $200 to $275 each pay period to get an extra $200 paid into the IRS every time you get paid.