Websites can be excellent resources.
Be sure, however, to evaluate the website for bias.
There was a time when a .edu .org or .gov URL was a sign of quality, though that isn't always the case; for example, I one purchased richard.m.mikulski.org, despite not being an organization (nor especially organized, truth be told).
Consider a website like Institute for Humane Studies, which calls itself "institute for Humane Studies at George Mason University."
It is a .org, has a fancy website, and is "at George Mason University."
If you look at the about page, it gives you the board of directors, many of whom are academics.
What isn't on the website, and can only be found by looking at the 990 tax form (via our database Foundation Directory), is that it is funded by the Koch Brothers, and has a specific political agenda.