I’m making a site using HTML. But I want to make a registration function. But I can’t find a way when I look at multiple sites. Please let me know how to save membership data using SQLite in my current code.It’s my current code. And I want to make sure that nicknames that have already been used are not used when deciding nicknames.

Please tell me how to save nicknames, passwords, and e-mail values using SQLite database in HTML
And I want to store the value that I write in the input in SQLite
I’d appreciate it if you could tell me more about it

Link HTML to SQLite database to join membership and save data