What is the difference between は and が, subject marking particles?

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Question

What is the difference between は and が, subject marking particles?

Answer

See the two sentences below:

ちち は チョコレート を たべました。

ちち が チョコレート を たべました。

Both of them mean ‘My father ate chocolates.’

The first sentence with は basically just gives you the fact that he ate them.

The second sentence with が implies that the person who ate them is him. Not me, not you, that is him.

There are much more things about は and が, but this is one of the most important aspects you should know.

Use が if you want to make the subject of a sentence specific and exclusive. Other than that, use は.