How to convert web code to apk ?¿

Answer 1

Use MIT App Inventor! It's Free And Easy (No Coding Needed)
Check Some Tutorials on Youtube on How to Convert an HTML, CSS & JS Code to Android App...

Answer 2

Maybe this can be a stepping stone

https://www.sololearn.com/learn/1439/?ref=app

Answer 3

for which platform? i have bundled android and ios apps with apache cordova, you can do it from the command line but the ios apps exxpire after one week because I do not have a paid developer's license
apache cordova can also do windows apps but I have not tested it. the android ones are fine.