Be advised, Socionics started in the Russian-speaking world. As a consequence, most Socionics experts write their descriptions in Russian. Socionics in the English-speaking world is mostly limited to the internet, leading most English type descriptions to be written by the average Joe, not necessarily someone truly educated in Socionics.
That being said, while there are some descriptions missing, I find this site to have the most accurate descriptions: Socionic Types
As a slight side measure, I've made a table below for the various names of types, their first two (ego) functions, and their respective quadras (quadra being the the most prominent grouping in Socionics):
"Intuitive subtype appears by the calm, tactful, sluggish, uncertain of itself person. It seems torn from the reality, inert and little fitted out to the life. But this impression is erroneous, since it possesses the excellent intuition, which helps to it to establish useful connections and to find support in men of weight."
Spot-on. I'm what you would call a fat people magnet.