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We use a when the word that follows it begins with a consonant sound. We use an when it's followed by a vowel sound. This makes pronunciation easier.
She has a university degree.
It took me an hour to get home.
We use the – the definite article – when the listener already knows which thing we are talking about because it was mentioned before or because there's only one of them.
I'm going to take the dog for a walk.
Have you seen the car key?
They go to the school next to the bridge.
Things in general
When we talk about things in general, we normally use a plural or uncountable noun with no article.
Birds eat worms.
Water freezes at 0°C.
Children need a lot of sleep.
Particular groups of things
When we talk about a particular group of things, we use the.