What is wrong these?

Question

https://code.sololearn.com/cuWh3OxZkW5P/?ref=app
https://code.sololearn.com/cgKR8hSTL50q/?ref=app
https://code.sololearn.com/cJ5CosDh3li1/?ref=app
https://code.sololearn.com/cKCBOReZwmbc/?ref=app
There might be more, will comment if there are

Answer 1

https://code.sololearn.com/cgQBYUjXhNVs/?ref=app

Answer 2

Just read errors, they tell pretty much everything and they even show you where you gone wrong.