The problem is that 99.9% of people are not experts in the science of the conspiracy in question.
Exactly, and that's why it's important not to jump onto theories peddled by people who are also not experts in the relevant field. And generally, as a starting point, it's safe to assume that a single outlying opinion is less likely to be valid than the scientific concensus.
Most grand conspiracy theories are attempts to give a simple big explanation to complicated big events. Events like the WTC attack and the Kennedy assassination feel like they must have larger explanation than 19 terrorists or a single shooter.
Could plans bring down the twin towers and building 7?
Yes they could and it's been explained in detail how it happened. The alternative theories have all been debiunked and the 'experts' pushing the various conspiracy theories are invariably qualified in an unrelated field.
What about the bullet that killed JFK?
As above, the 'magic bullet', 'back and to the left' and 'the grassy knoll' have all been dealt with by the evidence and subsequent explanations. JFK the movie has a lot to answer.
What about 5g?
What about 5g? It's the same as 4g and 3g - a sectio of teh elctromagnetic spectrum:
That's all it is - a slightly higher frequency than the current 4g band.
Climate change a hoax?
No - the scientific concensus is cear that climate change is happening and is a result of human action. As you say, there are a few scientists who question climate change but many of them are not climatologists. Apart from anything else, the effects of climate change are with us and are only going to get worse. Maybe should also take account of the fact that climate change hoax stories are actively generated and pushed by oil companies and far-right-wing organisations. That's not a conspiracy theory, it's an actually conspiracy.
https://www.theguardian.com/environment/2019/jun/21/william-happer-trump-white-house-climate-crisisI’m an expert in none of the above. All I can do is read as much as I can (if I’m interested) and see if I can make sense of it. There are some scientists who question climate change. They are more qualified than me so who am I to totally dismiss them?
See above about climate change.
I’m not saying I particularly have an opinion (before the insults start) but when Im left with the official story coming from the mouths of known liars and people that genuinely don’t give a shit, then I think it’s natural to question things.
I'd recommend separating 'the official story' from 'scientific concensus'. They are two different things. The 'official story' of the WTC attacks was put together by a host of independent experts and has been checked by hundreds, possibly thousands of subsequet fact checkers and follow-up investigations. The conspiracy theories (of which there are many) have all been addressed and debunked.
And if you're concerned about stories coming out of the mouths of liars, I'd suggest you take a good look the sources of the conspiracy theories. There isn't one source and the motives range from the genuinely inquistive to the malign.
Moon landing hoax believers could be considered harmless in that it's irrelevant what they believe happened - man did go to the Moon - but persuading people it didn't adds to the 'they're all liars' mantra. And like the 'where's the plane' nonsense at the Pentagon, the 'where are all the stars' question seems initially convincing despite being completely wrong and explainable.
The first point of call is the science and good quality documentary evidence. get you information from bodies and organisatons that have codes of conduct can be held to account.
Remember that social media is now a prime target for right-wing disinformation and for Russian bot farms. if you're interested in conspiracy theories and getting your information from a Facebook group it's highly likely that Facebook's algorithm is pushing you information that reinforces those views. Twitter is more self-selected but the tendency is still to find yourself getting into a bubble. Web searches will tend to do the same.
Be skeptical, that doesn't mean being cynical. There are some really good podcasts about critical thionking and skepticism. The best is probably Skeptics Guide to the Universe.
https://www.theskepticsguide.org/And as a general point - just look at who has most to gain and who has already gained from the promotion of conspiracy theories: Trump, Johnson and Cummings, Frottage, Bolsonaro, Putin and many others throughout history. Johnson spent decades spreading lies about Europe. Trump and his allies have embraced QAnon.