Crypto investment?
There is nothing much to learn that to check the price of the cryptocurrencies that you want to invest, trace the price to the time the coin was created. Also you can follow market condition, there is bear and bull market, it is good to invest after a significant bear market.
For investment, check the time of bitcoin halving, check the highest and lowest price after and time they both occured. Bitcoin price is also affecting other cryptocurrencies, other cryptocurrencies follow bitcoin price but they are more volatile and riskier.
To buy Bitcoin
For privacy, use
https://bisq.network or
https://hodlhodl.com. But the liquidity may be low.
You can use instant exchange like Changelley or ChangeNow. But know that while using these type of exchanges, you can be forced to provide ID documents.
For other ways but no privacy
You can use common exchanges like Binance or Coinbase
Some sites to buy that may not demand for KYC:
https://kycnot.me/After you buy, know that you have to get your coins on noncustodial wallet as the final destination, do not hold on an exchange, you do not have full control of your coin on exchanges, exchanges have the full control, not you. To have full control, use a noncustodial wallet. For small amount, you can use Electrum and be careful of you online security and safety. For large amount, best to get yourself a hardware wallet or you can setup a cold storage wallet if you have the knowledge and experience about how to setup cold wallet appropriately and properly.
Open source hardware walletI will advice you to invest in bitcoin. If you invest in altcoin, know that they are riskier.