When you are looking through your eye-piece, you should see a set of lines with the numbers 0 in the middle and 1-3 in both negative and positive values.
When you are shooting you can keep an eye on that and keep it fairly close to the zero marker. But that is only a guideline. When it is bright outside, depending on the clouds and intensity of the sunlight, most aim to have that setting close to -1 exposure (EV = Exposure Value). if it is dark outside, most aim to have that setting close +1.
If you see that meter blinking one way or the other, will tell you if it is way over-exposed or under-exposed.
That's a good way to keep an eye on it when it is hard to see your LCD screen.
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R.I.P - FELLOW FF MEMBER, IZZY, BLK2k3GTS, will always be remembered. We will compete on a different course again one day.