“take a decision” is also a valid phrase: https://www.merriam-webster.com/dictionary/take a decision

Install GnuCash, learn accounting, and start tracking your money and use proper financial language. There is a lot of good financial advice out there (budgeting, investments, debt reduction), and all of that is much more efficient if a) you know where your money goes and where it comes from, b) you are proficient with financial software, and c) you can talk to the banks in their own language.