I am very glad about the existance of the internet. I can look things up, the contents of medicines, take or leave 'advice', find out things that need further investigation, all at the drop of a hat.
Before that, I had to read magazines, buy recommended books, trawl the library.......
You have to learn to read the 'right' bits - the same with books.
I can even find out which book to read and buy it in minutes.
I have had 'odd' advice from doctors in the past.
Now I can make sure they are right, follow it up and find out more and make sure that I am getting things right too. I can find out if I am doing the right things, eating the right things, getting enough exercise. And why.
It takes time and effort and doctors do not have the time to explain things fully in 10 minutes - they can point you in the right direction and let you go there!
The only problems are that things are not handed on a plate, it is information overload and there is a lot of rubbish to sift through. That is why I am grateful for websites such as this one. It is a very good starting point, and helps you negotiate the rest.
If people give you iffy advice on forums, you can check it out and make your own mind up.