In 21 century, the age of information, you can find the proof to any theory on the Internet. You can find any type of information there. The question is how do you navigate through the amount of bull*** and find the truth?
How do you know what to believe in this dump?
Well there is not one method for all ideas.
But the method I find most useful is to test a bunch of claims for internal logical consistency.
Assume everything the idea claims to be true, and then see if it all adds up.
Let me give an example which has been recently most astounding.
I have been looking at General Relativity and I noticed a glaring contradiction.
A black hole is said to have time stop at its surface because its gravity is so strong.
(This is called the 'event horizon'.)
But the theory also claims that gravity travels at the velocity of light.
(This is called gravitational waves)
So how could the gravity escape the event horizon?
Anything with velocity must have time ticking over, in order to move at all.
So the theory disproves itself on the basis of its own inner logic.