With your definition of HODL, which means holding your coin (bitcoin) whether the market is bullish or bearish, we do not need the two tips above.
First why doing research? Unless you are talking about hodling altcoins, which shoudn't be called HODLING but HOLDING .If you want to hold altcoins for a long time , then DYOR in order not to hold a coin that will extinct in your wallet.

Since a holdler can hodl for 5 to 10 yrs, what is the essence of paying attention to fundamentals? Do you mean to check if bitcoin will not make it to next year?