If you are a beginner, then you do not need to trade anything except bitcoin. Experienced traders can determine the perspective of some coins and make trades with them because some altcoins look quite interesting in the long or medium term.
There are good markets which have huge volume such as usdt and ETH which have a lot of pair in altcoins. I think it's good not to just stay in the market specially during bear market.
Yes, we need to stay out of trading during bear market, but when it comes to long-term investment, bear market is the best for any investor to stay in the market and for trading, we have lots of trader that are also taking advantage of the bear market because it is this period that a lot of shitcoins gets pumped and dumped, and some pumping can go as high as giving 1500% profit within a very short time than long-term holding would do, but I am still not against the opinion of those who does not have the mind to do so to stay out of the market completely.
Playing with shitcoins in a bear market is like gambling and a trade of luck.