Can anyone teach me how to code apps

Answer 1

You can go through all of this. They will give you a fair idea how to create a app.
here check the posts & code they can benefit you.

https://www.sololearn.com/Discuss/452538/?ref=app
https://www.sololearn.com/discuss/318950/?ref=app
https://www.sololearn.com/discuss/333866/?ref=app
https://www.sololearn.com/discuss/321242/?ref=app
https://www.sololearn.com/discuss/658458/?ref=app
https://code.sololearn.com/W7X805sc4DPC/?ref=app
//SL Starter Pack
https://www.sololearn.com/Discuss/476490/?ref=app
https://www.sololearn.com/Discuss/595802/?ref=app

//SoloLearn T&C + Policy
https://www.sololearn.com/Privacy-Policy/

Don't get your account banned!

https://www.sololearn.com/Discuss/593497/?ref=app

https://www.sololearn.com/Discuss/596094/?ref=app

//some resources for further learning!
https://code.sololearn.com/WBHiShj1ublU/?ref=app
https://code.sololearn.com/W8iMGXTusS8V/?ref=app

https://www.sololearn.com/discuss/510275/?ref=app
*credit : @Lord Krishna

Answer 2

You're on a website that teaches you how to program. Start going through all the courses. If nothing more, do Java and SQL.