You might be thinking of "Know Your Customer" laws, which only apply to some industries and definitely not private persons for a blog. It applies to industries like financial, identification and certain types of commerce (eg: regulated products). Even then, only in some countries.
I don't know where you live but maybe just knowing of the concepts should be helpful. I think you should be totally fine to start a non-commercial website without consequence, but of course this isn't legal advice.
I don't know where you live but maybe just knowing of the concepts should be helpful. I think you should be totally fine to start a non-commercial website without consequence, but of course this isn't legal advice.