So… how do I worldbuild?

Hey, so I am a worldbuilding newbie. I’m working on a large project, but I am having an awful lot of difficulty in the process - I am planning on working on a regular old fantasy story. Nothing too crazy.<br><br>Where should I begin? What are the most important things to focus on in worldbuilding? Any help would be much appreciated, I don’t know where to start at all lol.<br><br>Thanks in advance.