Is it OK to use try catch?

With a try catch, you can handle an exception that may include logging, retrying failing code, or gracefully terminating the application. Without a try catch, you run the risk of encountering unhandled exceptions. Try catch statements aren’t free in that they come with performance overhead.

How often should you use try catch?

You can use as many try/catch blocks as you want. Using exceptions gratuitously is where you lose performance. For example, you should stay away from things like using exceptions for control flow.