When you see it in the whitepaper or road map, you think it's fine and you see that there are many communities and active in social media platforms or groups like discord, telegram and others, then you decide if it's fine for you. this apart from being listed among the top cryptos in the market.
No guarantee the projects are good although the roadmap and whitepaper look convincing. I've experienced many projects that have great whitepaper and clear roadmap, but they also end up with a failure. Most of the projects have the problem on the consistency in developing the projects. The projects are only good in the whitepaper, but in reality the projects are never implemented the same as in the description in the whitepaper. So, be careful and do more complex research! Don't too easy to believe in the whitepaper.
There are many aspects to being able to determine whether a project is good or not determining, of course, the whitepaper is also included in it and sometimes many people are fooled by the white paper that is presented, which is not necessarily, as you say, that it is not implemented properly. It must be remembered that many people copy and paste whitepapers from good projects and that is real and no longer a secret. Actually, a good project can also be seen from who is behind the project, because every experienced person can usually lead it to a good and reliable path.
Once again, luck cannot be separated from this phenomenon. they have analyzed it well. In the end. Luck is not on our side, the project is successful and does not pay properly or runs away.