Robin thank you, especially for your last statement, "It's not about time or experience, it's about commitment and responsibility to correctness. I started WikiTree in November, 2015. I am probably considered a "newbie" by most. I'm working hard, several hours each day, on WikiTree profiles. There are lots of things to learn, and lots of details on Wiki are hard to find... such as the quiz, the merge feed, the merge video mentioned in the answer from Michelle.
I'm working with PGM, Military & War, and with Sourcerers, primarily. I started working with them even before all my family was entered, because I think the mission of WikiTree is valid - to collaborate with connecting the human family on one tree. I am thrilled when I find unsourced files of people who can be added to Military and War because they were a part of the American Revolution, or possibly to PGM because they emigrated to New England before 1640. When I add sources, biography, footnotes to profiles I feel a sense of accomplishment - I am honoring these people, and future generations will see this tribute and acknowledge the greatness of our human family.
Additionally, I want to say that in my work on WikiTree, I come across many, many profiles where the pm has been on WikiTree for years and years - with a biography that includes only unsourced gedcom information.
In October I was welcomed graciously and generously to WikiTree. A few people came along side me and helped me get started. Is it true that the more deeply one gets into WikiTree, the hierarchy is revealed? Do some of the "old-timers" want to keep the group small? I hope not. The purpose of WikiTree will not be accomplished with that mindset.