Usage of Articles in English
Zero Article
Here you can find a website that explains the purpose of the zero article
Next, Last
We went to the theater last week
Languages, School subjects
I'm learning French
TV
There's a good film on TV
Years, months, days
2016 was the best year of my life
Meals
What time do you eat dinner?
General Meaning
I don't like children
The
Musical instruments
I can play the piano
Superlatives
He is the best father in the world
Common places
We are going to the park
Only one thing
The Moon looks beautiful tonight
Specific things
The children are in the garden
Second Mention
I saw a man in the park. The man was old
A/An
Descriptions
Paris is an interesting city
Jobs
Paula is a teacher
First Mention
I saw an old woman and a dog in the park