There are many schools of thought on this.
I would say, as a beginning, you should invest a substantial amount into index funds. This is a group (portfolio) of stocks, bonds and potentially other assets that aim to track the whole market. For example, the S&P 500 is an index fund that is made of the 500 largest US public companies. This hedges your bets slightly, meaning if 1 sector is affected then your investment may not fall in value as much. It also means that you will have lower growth than some other more "speculative" investments. The S&P 500 has historically returned 7-10% annually, which is greater than inflation and normal bank interest rates (on average). Choose a cheap broker to invest in index fund and invest in a Stocks and Shares ISA, if you are based in the UK. Examples are: Vanguard, Freetrade, Interactive Brokers etc. The cheaper the broker the lower their fees because remember all fees reduce your percentage gain.
Once you understand index funds, you could dive into picking individual stocks but please don't do this just for hype and to make a quick buck. You will get burned and be donating your money to Wall Street, if you don't know what you are doing.
For crypto, I would suggest treating any money that you invest in crypto to be a sacrificial offering. Assume it will go up and down by massive amounts weekly. You have to be able to stomach the risk.
You can set up a binance or a coinbase account to invest in crypto. I would recommend coinbase at the beginning as they are very beginner friendly. They charge high fees on their ordinary account but, once you understand how to buy and sell crypto, you can move over to coinbase pro, which has much lower fees. Also, Binance has been in trouble with the FCA recently so keep that in mind. Start out with the most dominant coins: BTC, ETH, ADA, SOL and then maybe research about smaller cap ("sh**") coins. The smaller coins have higher risk, but potentially higher reward (often there is no reward). Crypto should be your last chapter of learning about investing and should be considered gambling.
A few general tips:
Don't YOLO large amounts of money unless you are in unpayable debt or insane.
Only invest what you can afford to lose
Think about timescales. Only invest money if you won't need it for at least 5 years.
Take your time with learning about investing. Learn about it yourself and don't listen to anybody online as your only source of information as they are likely the ramblings of a madman.