We don't need to learn everything about trading before we start, to have the basic knowledge like chart reading, simple strategies, and the right choice of coin for trade are good enough. Learning could be a process and from time to time, the experience will give us more and understand the market movement.
Many platforms offer different bots and their strategies, but I think anyone who uses a bot to trade must have their own custom bot and made solely according to their trading strategy. Such bots are more expensive, but in the long run they are more cost effective because they offer greater security and flexibility.
Trading don't give assurance that we can make a good trade having them. And talking about the security, nothing would change, it totally depends on us and what exchanges we have used. Why many traders have not urged us bots it is because they don't see huge changes from it. I know it works for us on behalf but all the decisions are still coming from us.