Hi there,

Changing strings and when to change them are completely up to the player and their preference. Some players like really old strings, while others prefer the feeling of fresher strings. It's all personal preference.

I like to change my strings when the guitar sounds a bit dead. If you keep really old strings on a guitar, they may be more susceptible to snapping, and if a string snaps due to wear, that's probably a good time to change out the whole set.

Here's a tutorial on how to change strings: https://www.guitartricks.com/lesson.php?input=24114&s_id=1974