Best tutorials or course for specific app creation

Hi, I’m working through the youtube tutorials but ultimate want to make just a few apps to be used internally only by just a few people. Do I need to submit anything to apple to do that (I don’t want it on the app store). Basic deck app with colors and symbols- choosing a few symbol cards/choosing colors to go with those symbols(by overlaying symbol cards over different color choices) etc. What tutorials or course will get me to that completed app the quickest. Thanks! Enjoying learning from you!!!

@BOcode Hi, Anyway you cannot able to share the app without knowing the Apple.
You can have Apple Developer Account and add your user device UDID on that and share the .ipa file to them.
Or You can register as an Apple Enterprise Account, and share the .ipa file to anyone.