Lord Chaitanya (Shri Chaitanya Mahaprabhu) appeared in Navadwip in 1486 AD at Mayapur (Antardwip). He appeared in the form of devotee although he is Krishna himself. Lord is called triyugi because he doesnt appear in kaliyuga. In kaliyuga, he appears in the form of his devotee. Lord Chaitanya performed pastimes for 48 yrs and taught the process of Krishna bhakti. Lord Chaitanya didn’t compose much literature. Rather he instructed his followers to read Shrimad Bhagavatam. The only literature composed by lord Chaitanya is Shri Shikshashtakam, a set of his teachings composed in 8 verses. These verses sequentially explain the process of Krishna bhakti. These 8 verses should be the garland in every devotee’s neck. If lord himself has written something, we need not read anything else.