Do this one thing before learning to code

Pick a professional username and use it for all your online accounts. It'll be your professional brand for many years, if not the rest of your career/life.

The best choice is your first name and last name. Use a website like https://namechk.com/ to check if your username is available. If your name is already taken, add a qualifier that won't change, e.g. janedoedeveloper. You might not want to use your location in case you move. Try not to use numbers, e.g. janedoe90. Apparently, it's out of fashion.