How can you increase your credit score?

My past errors when I was younger-teenager-made my credit score ridiculously bad and now I am still paying off debts and bills and everything. I just want to know plain and simple how to increase my credit score to be like my mothers(which is unbelievably good-the high 790’s to low 800’s) from the pit I am in. Just real advice and know jokes please as this is serious to me. Thank you kindly.

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