As of right now, Bitcoin is the most well-known cryptocurrency. If you're going to invest in Bitcoins or altcoins, Bitcoin is clearly the best choice. Nevertheless, a variety of factors should also be considered carefully. The value of your investment, whether in bitcoin or altcoins, will fluctuate, and a loss is always possible.
Losses are possible only if you sell at a loss, but this factor will only depend on you, so it can be excluded if you have discipline in investments. Consider an example if you bought bitcoin at a price of 20k, and at the moment your investments are at a loss, you can now sell at a price of 17k and this will be a loss -making investment.
But you can just wait, it doesn’t matter how much, how many are required, one or two years, when the price will be 40k, or 80k and your investment will be profitable. You can also use this time when the price has become lower to buy more bitcoin and thus make the purchase price even lower. If you understand what you are doing, then your investments will be profitable if negative news can affect you in such a way that you can sell at a loss, then it is better not to invest in bitcoin, because the situation when the price is going down, can be repeated many times.