@renda0709 assuming that you are a US person ( citizen/ GreenCard/Resident for Tax Purposes ), and if you only have W-2 income, I am confused why the question about ? Or perhaps you had foreign income last year ( tax year 2022 ) ?
However, to answer your question --- Foreign tax credit is for the purpose of reducing the tax burden when you have the same income being taxed by the USA and a Foreign Taxing authority. This way you reduce the bite of double taxation.
Don't know how to help without some more info.