Any proper resources on mutual funds?

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I have been interested about learning the investment stuff for quite a while. A lot of companies, with various pricing, claim they offer the best services and education in that field. However, I can't seem to find any reliable resources. There must be some official authority in the field of mutual funds. Hence, they would have the best-quality education. If anybody has found something that has worked for them, I would like to learn more. Open to any of your suggestions. So far, I like how Investors Group is standing on mutual funds - very reliable and successful company. However, there are always high risks involved with mutual funds, since this a volatile type of income. But volatile also means "higher income" in comparison to the more reliable longer-term investments.