One thing that helped me get a handle on things was creating my own magazine and just playing around with it. Magazines = subreddits, and articles = threads. An article is meant to be more text based, and you can also select the option to upload pictures/links to the magazine instead. I haven't messed with the whole microblog section but if you select "add post" it will upload to the microblog of the selected magazine instead of the thread list. Boosts are different from likes in that they boost your personal 'reputation' instead of ranking thread popularity.
Overall I really like the level of customization kbin offers, definitely needs some UI improvements but it kinda feels like a hyperpowered version of reddit once you get used to it.