The difference between bitcoin and altcoin is that in most cases the more altcoins there are the more scams there are. But not all altcoins are scams, some coins are much better. But Bitcoin is the best coin in the virtual world. Investors tend to invest more in Bitcoins than Altcoins as they never face losses by investing in Bitcoins.
Bitcoin is leading the crypto world and it is popular among most of the people. If anyone join with crypto, he has to familiar with Bitcoin first. Investment is always risky and Bitcoin isn't out of it. But investment on Bitcoin is a wiser decision and risk is comparatively low here.
Bitcoin stands at the top of all currencies it is a very common thing that markets always bounce back after major crashes. Besides investing in good bitcoins is less risky bitcoin price is based on investor demand bitcoin is at an all time high even though demand for investments in other currencies is low. Long term investment will give good returns.