Hi @NoNameOH
As stated by @rsaikrishna, you should use OData for filtering queries.
It's very simple, if your list has a column named "Country", and you need to filter only "France", the OData is:
Country eq 'France'
If you need to filter numbers, it would be for example:
Quantity gt 5
The first parameter "eq" means "equal", the second ("gt") means "greater than".
You can however, dynamically change the OData value like this:

Greetings from Colombia.