I am confused whats the thing before words that are like this ll'albergo or l'albergo

Buongiorno and welcome to the Rocket Italian Community. albergo is a masculine noun therefore it needs the masculine article in front of it. Articles are words like "the" and "a" or "an". "LO" would be the article used in this case but because albergo starts with a vowel. Vowels are "a", "e", "i", "o" and "u". LO" looses the O and takes the apostrophe .Let's see how it works: LO ALBERGO becomes L'ALBERGO Tutto chiaro? Is it all clear? Let me know if you want further examples. Ciao Romina

what lesson will I learn about that

Buon giorno again! Welcome to Rocket Italian Community. the explanation about the articles is in the grammar section of the " 1.9 Likes & Dislikes, More Articles, Superlatives". Enjoy it! Romina