Fish and fishermen love to have it, mastering it is a common habit.

I’m secretly watching, providing an ear. Legends say I’ve made way to a giant’s frontier.

I have seas with no water, coast with no sand, towns without people, mountains without land. What am I?

I go up but never come down, and I only stop once you're underground.

removing my first letter makes me related removing my second letter makes me no good removing my last letter makes me active removing all three makes me me