As it is customary, due diligence is often conducted by smart and inteligent investor before investing into any financial assets. That brings me to the two questions of this thread;
1. What is the best process to conduct a research about Altcoins to invest in?
2. Based on your opinion, what are the top 5 Altcoins i need to focused on and probably invest in?
First of all, if you do not read the whitepaper you will never know what is going on, you will blindly invest into something on "what people said" and that is not normal, you have to read the whitepaper, plus reading your first ever whitepaper you will not be good, understand only some of it and not all of it and you will not really catch anything, but when you read your 50th whitepaper you will start to understand what is going on and if they are copy of something else or if there is anything risky, or if they are too amateur and just there to steal money. This is why at the end of the day we are living in a situation where you will gradually get better but you need to spend time on it.
Secondly look at the team, not who they are but how they talk because if they are good people that will make you money you will understand it by how they work and how they respond to questions, people who get angry will always be scammers, and people who are decent will give you right answers and links to help you understand very politely.