Building an app

Hi I’m a ServiceNow developer in the UK and use JavaScript specifically for ServiceNow. My knowledge is built around ServiceNow so I wouldn’t say I’m fully proficient. I am pretty good at using resources to teach myself, I taught myself what I know just now and also taught myself how to use (and break) ServiceNow. Anyway, the point of this is I’m a hobby baker in my free time and I want to expand my programming knowledge by building an app for the baking