I did not learned all i know by myself. R is above all else a fantastic community and i have learned from many kind peoples. I strongly recommend you to check blog of Yihui Xie, David Robinson, Julia Silge, Maelle Salmon, R Studio Blog, R Weekly, R bloggers and Simply Statistics. You will learn a lot from theses blogs.
For more about who to follow and how to get involved in R community check my post on this subject here.