In fact, I would advise newbies to stay away from altcoins and only invest in Bitcoin in order to be on the safe side of the game, as there will be many shitcoins that will not recover after this bear market.
As a beginner, don't be overly eager to invest in any project without conducting your own thorough research.
Though I do agree with your statement, there are still some notable altcoins that are worth investing on. For example, ETH is a great altcoin where you can potentially earn large sums of money at the end but this would require either a short/long-term investment on your side. But if a person wants to maximize and capitalize on his investments, then investing in BTC may be the best move.
Personally, investing in BTC is the way to go. If you pair it up with one's personal research about the market and potential breakthroughs, the chances of a person profiting at the end is significantly high compared to the average person who invests without any resource or information at hand.