The type of strings you should use depends on factors including the type of guitar, the type of music you want to play, and personal preference. Every type of string has its own unique qualities in tone and how it feels to play.

The thickness (also known as gauge or weight) of strings has the most impact on tone and feel. Lighter (thinner) strings are much easier to press down and perform bends or hammer-ons with. Heavier (thicker) strings are more difficult to play, but have a deeper tone with more bass.

Strings may be roundwound, flatwound, or half-round. This is referring to the outer winding present on the lower strings. Roundwound strings are the most common due to their bright tone and ease of playing. Flatwound strings have a more mellow and warm tone and are stiffer and more difficult to play, while half-round lie between the two. 

The material of strings also affects their tone. Electric guitar strings are typically steel or nickel, with steel giving a brighter tone while nickel offers more warmth. Acoustic guitar strings are typically brass or bronze, with brass giving a brighter tone and bronze a warmer tone; however, acoustic guitar strings may also be made of nylon, which are typically used with classical guitars. They are easier to play, though much quieter, and have a light and mellow tone.

There are also coated strings, which have a polymer coating designed to increase string longevity at the cost of slightly dampening the sound and a higher price.

If you are unsure or new to playing guitar, I would recommend light roundwound strings, made of metal rather than nylon and without a coating for their versatility and ease of use. However, each individual has their own preferences, so ultimately the best way to learn which type is best for you is through trying different strings.
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