It's an unhealthy advise telling someone to stick with Bitcoin when trading, deciding to trade with Bitcoin or any other cryptocurrencies issues same losses, nothing distinguishes the risk management, it all goes down to how the funds is being managed, using Bitcoin to trade does not stop you from losing as well. Anyone who is scared to lose should be focused on investing their funds in Bitcoin, either strategies are okay depending on the individual balance and how he understands the market.
Trading is generally risky but bitcoin trading is better. Altcoins are easily manipulated. Let me show an example
See how this coin was manipulated since 3 days ago.
As a newbie, you lack the knowledge that will guide you in trading, and you will easily sell your bitcoin at a loss if the bitcoin price drops because you cannot control your emotions to hold your bitcoin until it rises back. And you will spend so many months to gain this knowledge, and at the end you will not still be successful in trading. It would be better if you focused all your energy on accumulating bitcoin for the long term and saved yourself from the stress of always reading charts and the emotional damage that comes with trading. When it comes to accumulating bitcoin for the long term, you don't need wide knowledge about bitcoin before you start accumulating it. What should be your concern should be your own finance to know if you will have a discretionary fund that will allow you to invest in bitcoin. As a newbie, it is good to adopt the DCA strategy when accumulating bitcoin because it will allow you to be consistent in accumulating bitcoin even though bitcoin price is increasing or decreasing, which will make you not to wait for bitcoin to dump to a particular price before you can accumulate it.