Aditya Republic said:
Is there some website where I can learn more about the tactics and weapons used by militaries across the world?(not websites like GFP and Wikipedia)
Tactics are best learned from war to war unless you want to delve into the field manuals of militaries around the world. For instance, my first baptism of fire for reading about tactics was reading 'Knights Cross' by David Frasier about Field Marshal Erwin Rommel, Rommel's 'Infantry Attacks' which was the trieste on tactics from the first World War and 'The Road to Arnhem' regarding the 101st utilization during Operation Market Garden. Reading books by the leaders who directed the armies would be your best bet or watching documentaries. I don't think there's a good site that does this though.
As for Weapons of War, I used to know quite a few but lately I just use what I know, Jane's Defence Weekly, Wikipedia a bit, Global Security for in depth and sometimes the Federation of American Scientists Military Analysis Network.