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.
Here we see the fretboard and staff together. The low E string is the lowest note shown on the staff, and the high E string is the highest note shown on the staff.
A good mnemonic to help you remember these string names, starting with the first (highest) string, is "Every Bad Guy Does An Errand."