As a beginner, one of the very first things you need to learn is the string numbers. Knowing the string numbers helps us communicate. We number the strings from the smallest string to the largest string.
Our open strings have letter names too! Named for the note they are tuned to in standard guitar tuning. A good mnemonic to help you remember these string names is "Every Bad Guy Does An Errand," starting with the first string.
Here are the numbers and names together:
1 - E
2 - B
3 - G
4 - D
5 - A
6 - E