If the advice is about what to buy with, where to buy from and where to keep your bitcoin then it's generally a good advice that works for everyone, if the advice is about how much to buy with then that's a completely different story, different people have their different buying capacity, if I can spend 50k naira every week to buy bitcoin that doesn't mean I will just advise anyone who wants to invest in bitcoin to do the same, maybe what you can afford is 10k naira a week or maybe less so instead of trying to invest with the same amount that I invest with, you should invest only with what you can afford.
What some people don’t understand about investing in bitcoin is that you can not be like someone, and when you try to copy any other investors you may end up selling your bitcoin when it is not the right, you will have different ideas from many investors but that doesn’t mean that you should do the same thing they are doing, if you the person you are following is buying bitcoin with a big amount, it doesn’t mean that you should do the same thing, because you don’t know his plan.
It is not every advise you must follow as a new investor, as far as you understand bitcoin and you know how to invest in without having any problem, you can do what is best for you without not listening to anyone, but there are some advise that is also very important, most especially the one that is being repeated any time you come across a post, but you need to be yourself when you are buying or holding bitcoin.