Strategies makes sure you are less risky but doesn't remove the risk totally. If we have to say that the most safe way to trade is TA, that would be correct. However that doesn't mean that it would destroy all the risks, there are still risks even if you do TA. If you learn TA by basically studying as much as you can and you manage to somehow get a great knowledge, you would know what bitcoin "should" do but never what it "will" do, that is kind of the point here.
On the other hand, not learning it means you are ball parking and eye balling and that is not really a great idea neither, you should not do that. So there is a risky method and there is a less risky method, that's about it. Of course it all depends on what you want to do and how you want to trade as well.