Me gustaría saber una forma para practicar SQL , alguna página o algo

Answer 1

install xampp so you can practice offline until you are ready to host online your website with database access

Answer 2

ok Thank you

Answer 3

In the link above you can pratice SQL queries:
http://www.headfirstlabs.com/sql_hands_on/

Or may you can considere install MySql and try create tables, run queries in a local host:
http://stackoverflow.com/questions/20544312/how-to-create-localhost-database-using-mysql