How to send something to the database, on a php page, but at the same time be sure that it will not be broken?

Question

PHP

I have a page, I indicate the date on it, send a request and get numbers from the database, everything is simple.
But if you open the page with a devtool and write some nonsense or request in the date value, then for example you can delete all table data.
I can't find anything on the internet how to deal with this.
<< I'm still a cancer, a few months in this area, so I apologize for stupid questions)

Answer 1

Google like this: "php protection against sql injections"
The main theses, so as not to go far:
1. Check and filter incoming data. If there should be a number, but in fact some other data came, we discard this request.
2. Screen data
3. Use placeholders and prepared statements.

Answer 2

Check all incoming data. For parameters in the request, use placeholders.

Answer 3

1. All incoming data is checked against the "white" list of regex expressions before the database is connected.
2. Prepared expression templates are used for database queries.