Remember to work on your cardio.
(media.scored.co)
My friend who was just around 21 at the time fucked up a deadlift at home and was in so much pain he was apparently stuck on the floor for a while. He had back issues for years afterwards. I worry it will come back to bite him hard in the future, but at least he thankfully has a good non-strenuous job. I've never tried a deadlift with real weight because of him, I think the highest I ever tried was just around 50lbs.