Wikis and Such

The idea of online access to word processing and spreadsheets is quite intriguing and hopeful. After trying to create a word document, I realized that the capabilities of editing and creating the documents are more limited than with Microsoft applications. One concern was that the "help" feature was not present. So, you could not search to find out how to solve problems. This in itself makes this application not useful at all. Perhaps if I investigated other application sites, I would find one that was easier or if I took the time to really work with it a while, I'd figure it out.
Wikis are kind of fun. I have personally gotten some information off of Wikipedia. (Funny thing is that I never realized that Wikipedia was a thing called a "wiki". Didn't know there even was a wiki.) But, I am mortified to think that anyone can change anyone else's work! That makes the source not a credible source for research or information. Does everyone know that? I doubt it, so that means that lots of people get information that may or may not be valid. However, that said, I can see a real advantage to this application. For instance, I am always trying to learn from gardeners how to propagate plants or take care of them. Consulting a wiki is perfect for this need. The wiki as well as the spreadsheet and word documents could be quite helpful for companies or schools to do internal business. Committees could input into a single document and plan for events. Lots of uses....AS LONG AS the unconcerned parties could not obtain access. That's my concern. Is limiting access a capability with all of these?