Leads duplicates

Leads duplicates

Hello,

I'm really new in CRMs and there is no-one else to ask in our startup. So here I go with my question after I explain our process.

- Leads are generated every time a user completes our online form asking for more information about our products.
They complete their name, email and phone number.
- If the same user asks for more info about Product 1, product 2, product 3...I want to see him as ONE lead, not as 3.
- May I set the e-mail adress as a primary key? If so, how should I ?
- Any other suggestions?

PD: I'm spanish native so, if by any chance you speak spanish, feel free to answer en espaƱol :D