>>746371>Tutorial?Just do shit and look up steps when you get stuck. There are literal thousands of Q&A posts about Excel on the web. 99.99% of possible questions have already been asked and answered.
Make a mortgage calculator, a tax calculator, an inventory tracker, a calendar with work hour tracking, a portfolio tracker, an accounting ledger, etc.
Each will teach you various interesting techniques and skills, especially when you start to cover for edge cases.
>Can I learn what I need with Google Sheets or am I gonna need a computer with Excel?I honestly don't know, I've used Calc for a job many years ago and it was very similar with annoying differences. Never used Google Spreadsheets. If you have all but 2 weeks where it matters - Office 365 has a 1 month free trial. I'd feel more comfortable practicing with the real deal before I need it, but you do you.