Au ecole / à l'ecole
Hello, so I'm pretty new to french and I looked up prepositions and focused on "à" and read that à + le turned into au. Then I saw the example à l'ecole which I thought should have been au ecole because ecole has the article le? I'm confused.
Regardless of gender, any noun that starts with a vowel sound should take l' as its definite article, not le or la. This is why au école - it would require you to start with à le école, but you don't - you're supposed to start with à l'école, which then precedes to not contract.
^1 except les h aspirés : every French student's favorite little minutia /s