How and what not to invest?

First of all, you should not invest under the influence of emotions, because they are a bad advisor. This applies to both the euphoria generated by market increases and the fear caused by sudden declines.
Second, if an offer looks too good to be true, it probably isn't. Like emails from Vitalik or Gates that promise to double what we send them to their account.
Thirdly, you should not believe third parties who insistently praise a given product, because we do not know what their intentions are and whether they do not have a direct or indirect benefit from finding new investors.
Fourthly, you should not invest in what you do not understand or cannot explain in a few sentences the mechanism of operation of a given product. Too much complexity of the offer is often caused by a deliberate action to hide the unfavorable aspects of the contract from the investor.
Fifth, we never put all our eggs in one basket, even if the investment seems secure. Capital preservation is paramount.
Sixth, we learn to curb our greed. You need to know when to get up from the table and reap the profits, or at least take out your initial investment. Otherwise, profits will forever remain on paper or in memory, and not in the account.
Seventhly, we do not invest if we do not have a secured financial situation for the coming months. Something can always go wrong and you will be left with no savings or, worse, with debts. If on top of that some misfortune happens to you in your personal life, the recipe for bankruptcy is ready. Therefore, invest only those funds that you can lose without worsening your life situation.
Eighth, taking too many risks almost always ends badly. Leverage is a tool only for experienced people, and the golden shot is one in a million. If you are not born with a bonnet, give up and look for safer options. It is better to eat with a small spoon, but systematically, thanks to which you will multiply your capital over time.
Ninth, catching a departing train is a bad idea. This also applies to financial markets. If an asset gets a lot of publicity because it made people a lot of money, stay away. The faster the increases, the steeper the decline will be. Most likely, you will not have time to earn and withdraw your money, and thus become a capital provider for the sharks in this industry.
Tenthly, we learn from experts in the subject, not from the lady from the greengrocer or taxi driver. Assume that they are not after-hours investment advisors, so treat their advice on what is worth investing in as an anti-indicator rather than a recommendation. It is not without reason that it is said that when random people talk about the investment of a lifetime, the bursting of the bubble in a given market is imminent. Therefore, invest in reliable education first, and only then throw your money into the market

One should not invest in projects that seem too risky or illegal. Avoid investments that promise too quick a return, as they may be pyramid schemes. Regardless of what you are investing in, always conduct proper research and consult with experts to avoid potential traps.