She lived with her uncle Fulbert, a canon of the cathedral of Paris.

I do not know what a canon of a cathedral is, but that is what he was.

He was nothing more than a sort of a mountain howitzer, likely, because they had no heavy artillery in those days.
Suffice it, then, that Heloise lived with her uncle the howitzer and was happy.

She spent the most of her childhood in the convent of Argenteuil -- never heard of Argenteuil before, but suppose there was really such a place.

She then returned to her uncle, the old gun, or son of a gun, as the case may be, and he taught her to write and speak Latin, which was the language of literature and polite society at that period.
Just at this time, Pierre Abelard, who had already made himself widely famous as a rhetorician, came to found a school of rhetoric in Paris.
The originality of his principles, his eloquence, and his great physical strength and beauty created a profound sensation.