Hi, welcome to the SeaTable Forum!
Your question is although quite basic, but also concrete! I’m not sure if you have already read the SeaTable Admin Manual? It’s here: https://manual.seatable.io/config/dtable_web_settings/
Hopefully, you’ll find some useful information there…
There are many editors you can use, like Brackets, Sublime, or Visual Studio Code. If you are in a Linux environment, you can just type nano ***.py to open the nano editor.
However, SeaTable on Docker is not really for beginners. Installation and configuration could be challanging. I recommend you the SeaTable cloud version: just register at www.seatable.io and you can use the SeaTable Cloud for free, if it meets your needs!