Bitcoin is very easy to understand, the problem is people are waiting price to reach its all time high price and when price reached maximum then they start investing in bitcoins and faced huge loss and then say that bitcoin is risky and difficult. Simple rule buy at low and sell at high!
For anyone that is just interested to invest and make money from price increase, it's very easy and simple to unknown Bitcoin. The only thing the person need to do is buy when price is low, and sell when price increases or when they have gained enough profit. The other technical part of Bitcoin is what can actually take some time for one to learn everything, but investment is the simplest part of Bitcoin.