How to check more than 50 keywors ranking?

How to check more than 50 keywors ranking?

You can check through manual way, otherwise webmaster tools is also good option. are you looking any SERP checking tools ?

I think In free way It is not available, you can use paid tools.

You can use some good paid keyword rank checkers.

You can find manually or use paid tool like "semrush"

Digital Door lock

I think Free tool is not available. There are Many tools are Available.