Help question about w4?

When I first started my job I didn’t quite understand claiming allowances so at the time I put 0. So I’ve been reading when you put 0 that’s why the taxes take too much from my weekly checks. I’m single I work one job I have no children. My parents don’t claim me. even though I still live at home plus I’m 26. Can... show more When I first started my job I didn’t quite understand claiming allowances so at the time I put 0. So I’ve been reading when you put 0 that’s why the taxes take too much from my weekly checks. I’m single I work one job I have no children. My parents don’t claim me. even though I still live at home plus I’m 26. Can I fill out a new w4 and change that 0 to a 1 or 2? Will I still get a refund at end? I’m so confused please explain this?
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