Weekly "No Stupid Questions" Thread

Welcome to the weekly thread for questions you might feel are too basic to deserve their own post.

No question is too simple - we all start somewhere. Whether you're wondering what an ISA is or how to read your payslip, ask away.

Ground rules:

• Be kind to beginners
• No question is stupid
• Check the wiki and flowchart first, but don't worry if you missed something

Fire away!