When do I change my guitar strings?

Get Elixir Strings.

They last 5 times longer then any other brand.

They can last up to about 4 years and then they'll get dull and lose tone

They have electric and acoustic strings and you can get quality amp cables from Elixir too

Their not highly expensive but they might cost you a bit.

What kind of guitar(s) do you have?

Acoustic strings and electric strings are different to change strings on an acoustic guitar i find a peg winder helps with pulling out the bridge pins and winding the strings round the tuning heads quickly strings should be changed about every six months depending on how much you use your guitar i always use Martin Light Gauge strings (the ones in the red packet) 80/20 bronze once you've changed your strings you should notice when you play everything sounds brighter and clearer

Depends on a few things ...

How often you play and how light/heavy you play. New strings have an elasticity that some people prefer, and it diminishes over time. This elasticity gives a "bright" sound. This usually will last a couple days till the strings settle.

The more you play, the more your strings are corroded by sweat and oils in your skin (washing your hands before playing is a cheap way to get some longevity out of your strings). Environmental factors such as temperature and humidity can affect your strings (wipe strings down with a cloth when done playing and store guitar in the case)

You can purchase products you apply to the strings to coat them, providing some limited protection that will help get a few extra miles out of a set. There's also strings you can buy that come with a nylon coating that intend to serve the same purpose. I tend to stay away from these - they're expensive and lose their elasticity within a few days any way.

Letting strings go too long before changing can be hard on your guitar frets and fretboard, as well as your fingers. A test I use is to scrape a pick underneath my strings, if a bunch of gunk comes off - probably best to change them. Another measure to change strings is if you break one - I find it better to replace the whole set rather than individual strings. It helps to ensure consistency of string gauge and sound. Strings should definitly be changed if there's broken/frayed winding on the wound strings or rust.

There's differences between electric and acoustic strings - Acoustic tend to be bigger and are commonly bronze wound (looks like copper). Electrics tend to come in smaller gauges and are commonly nickel or steel wound. Acoustic strings are heavier to facilitate the vibration required to make a wood guitar resonate - electric strings are daintier because most of the amplification required is produced with minimal effort electronically.

It's not recommended to put acoustic strings on your electric guitar - as they tend to be a heavier string, it requires more tension to tune them to standard pitch, in some case more tension than your more delicate electric is designed to handle.

Best kinds of strings to use - I recommend cheap ones. You'll wear them out just as quick as expensive ones if your starting out. As you play a bit and get experience, you'll experiment and find a preference for particular strings made from certain metals and under different manufacturing methods.

depending on how much you play it varies - if you don't play often they usually last up to a year, if you play everyday probably about 3 months.

acoustic strings are usually bronze, electric strings are usually nickel. i use electric strings on acoustic guitars because i like the gage (thickeness of the string).

you know when a string is ready to be changed because its not as "sharp" as it used to be. it can be unresponsive, dull, and hard to tune.

first off all id advice you to pic the 01-06 theyre good and secondly an electric guitar strings is much harder rather than a acoustic

if they rip you change