If you “take something into account” it means you “factor it in” or “include it in your decision making process”.So, if you “take something into account” you make it part of your decision. Here are some examples:
I’m not sure where I’m going on my next holiday. I’ll definitely take the weather and price into account when I make my decision.
He wasn’t the best student in his class but they still let him into Harvard. I think they took into account in the fact that his family is very rich and he played a lot of school sports at a high level.
Salary isn’t the only important thing when looking for a new job. You should also take into account your happiness when considering a new job offer.