I heard the knowledge of bitcoin (btc)and ETH since 2016 and i want to know the difference between altcoin and BTC and ETH.
Altcoins are the cryptocurrencies besides Bitcoin, this is considered as an alternative coin. They are likely ETH, BCH, Ripple, and many others. You can check on the Coin market Cap, coincap, COingecko, and many other trackers to know what other altcoins to find out. You will also find the lists of the altcoins on the exchanges. Exchanges are likely Binance, Kraken, Kucoin, Indodax, and others. In altcoins, you will also find the difference of "coin" and also "token". You should get more sources to be read. Are you willing to read? You can browse and use search feature on Google and you will find anything you search for.
One to remember is that in the crypto world, please remove the thought that "you will be rich easily". This may happen in some years ago. but for now, it should be considered about the chance, leading to the risks or profits that will be gained. Never also heard about the hype and also moreover follow the hype. Better to check and recheck about the progress of the crypto wisely, not only following and buying coins based on hype.
In this crypto world, you must also decide what will be you are. You may be only an investor, trader, bounty hunter, and also other positions. Whatever your position, you must learn more about it. learning by doing is also good enough to make you know exactly what happen in this crypto world.