Will it help my credit score to finance a car and to pay it off immediately?

I am trying to build credit so that my husband and I can get a homeloan. I am used to live within my means and to save until I can afford to buy what I need. I have enough money to buy a car in cash. But would it be better to finance it and pay it off immediately? Or would I have to pay off the entire loan (incl. interest) in order to boost my credit rating?
Are there any other better ways for me to use my savings as an advantage in building credit?
Thanks for your input!!!

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