Have an app idea.. but confused

Hey everyone I have an app idea but I don’t know where to start. Originally I wanted to create it in swiftui but I realized I don’t know swiftui. I know a little front end web dev but I really wanted to make it a mobile application first. Do you guys think it’s better to create the app has a web app and then if it’s popular/good, try to find someone to replicate as an IOS app? I’m confused any advice would be useful, thank you!