It's very important to study the market to be sure of the potential movement before buying a particular coin but for BTC, I think we all know that buying when there's a dip in price will always be profitable. I know we can't be too certain with the way we understand and predict the market but to an extent, we can make good decisions in Bitcoin because it can be easily predicted more than any other coin. Personally, I think saving money in BTC isn't a bad idea and should be encouraged
Unlike altcoins, bitcoin will always recover from every drop no matter how big the drop is but the problem is we cannot determine exactly when bitcoin will recover and bounce back. That could take days, months or even years. So, saving in bitcoin is not perfect and also has certain risks, and whether saving in bitcoin instead of fiat is beneficial or not will depend on the purpose of saving. If those savings are for a purpose in the near future, in case of an emergency, saving in bitcoin is not a good idea.