Well I will say that have the preliminary knowledge  of buying and selling is necessary  before think about any other way to make profit in cryptocurrency.
With that been said, there are several  ways one cab make profit from cryptocurrency without having to be a day trader or a professional  trader and one of the best ways is to just buy and hold and this has been proven to be one of the safest and less risky ways to earn from bitcoin  but to me it works  on the principle  of the higher your capital,  the higher your return and hence you need to have some reasonable  sum if you want to succeed.