There's no definitive “best fishing line.” Every style has its advantages, drawbacks, and ideal scenarios. Popping in clear water?
A typical line to cast for trout would be 4-pound test. Consider braided line of 30-pound test or more if you go after large game fish. A rule
A classic line option for any fisherman, monofilament is an individual nylon fiber that is usually inexpensive and is easy to work with. Monofilament is great