I dont know how to strenghen can i have some help ? Gracias!!
on the phone app go left from your tree page and youll see the strengthen skills button, on the website go to your home page (tree) and its on the right side
you can also learn from lyrics of spanish songs, and on youtube there is a cool sitcom for intermediate learners called "extra." Also, as someone else mentioned, just keep hitting "strengthen skills." Best of luck to you!