Wikipedia.org this is site what ever you want to know or details you require just type the url and search, one place for all.
My 10 yrs old son also is a great fan of Wikipedia.
One stop solution.
The App of wikipedia is also a great move by the site owner.
The vast area it covers also due to user’s activity the resource gets updated this is also a good option of this site.
The best option here also sometimes causes some issues like the ignorant users some times updates wrong information here, which are to be corrected.