Learn Italian: Al mercato ci sono tante cose da scoprire. - At the market there are many things to discover.

In Italian, when you connect a noun (like cose) to an action that describes its purpose or what can be done with it, you use the preposition da. So, "things to discover" becomes cose da scoprire. You will also see this pattern in phrases like qualcosa da bere (something to drink).

Could I say molte cose instead of tante cose?

Yes! Tanto and molto both mean "many" or "a lot," and they are completely interchangeable here. Just remember that because cosa (thing) is feminine and plural, your adjective must match it, becoming either tante or molte.

Why is it al mercato and not just a mercato?

When talking about being at a specific public location like the market, Italian usually requires the definite article (the word for "the"). Al is a combined word made from the preposition a (at/to) and the article il (the).

Since cose is plural, why doesn't the verb scoprire change to match it?

Because it follows the preposition da. In Italian, whenever a verb comes immediately after a preposition, it stays in its infinitive (dictionary) form. It doesn't matter how many "things" there are to discover!