It is the safest option to choose if you are not sure with other cryptocurreny but if you really want to trade other coins then you should choose that has strong market and is less volatile compared to altcoins which will decrease it's price for a reason. If you are on the right track then you can see that it is worth to trade. If you aren't taking the risk to choose other crypto to trade then I'd say you stick with bitcoin on your trading journey unless you want to.
But it is better to hodl Bitcoin and not trade it especially if you don't have much skill in trading. You will meet many bad situation in the market where you can panic and lose control. Using Bitcoin to trade is an option and not many people can do while they prefer to choose Bitcoin as their investment.
But no safest option to choose if that is trading because the crypto market will be unstable. You need to be careful when using Bitcoin for trading. Worth it or not will depend on your skill in trading.