LOL, the funny thing about opinions, especially in the horse world, is that they are like fingerprints. Everybody has one and every one of them is different.
There are certain things that are universal truths like horses need feed and water but you will find that pretty much everything else is up for debate. Much of how a person handles a horse will depend entirely on how they were taught, their own preferences, and their own needs and desires.
Everything can be debated (and some things are
) from the tack you use, whether or not to blanket in cold weather, what to feed, whether to shoe or go barefoot, whether to stall or turnout, etc, etc, etc and everyone will have a different opinion and their own reasons for doing things the way that they do. About all you can do is try to keep an open mind to new ideas, try the ones that you like the sound of, and keep the ones that work for you and your horse. Absorb all the information that you can and keep it in your memory banks even if it doesn't work for the horse you have now. Someday, you may have a horse that it does
You can never 100% trust the word of anyone, no matter how much of an expert they claim to be, whether they are publishing an article in a magazine or own the horse 3 stalls down. You have to consider what they say and decide for yourself if it sounds reasonable and sensible or if it sounds iffy. Never, ever be afraid to ask questions. If there is something that you heard about but don't know anything about, ask. If someone is doing something with their horse you've never seen before or don't understand, ask them to explain what it is and why they are doing it.
Perfect example is the leading thing. Lots of people like their horses to walk with their shoulders beside them. I don't. I prefer the horse to have their head even with my shoulder and for him to walk a bit out to the side. But as far as how everyone else does it...to each their own. I don't care how a person leads their horse so long as they have control over it at all times.
One of the wonderful things about being a member in a place such as this, if you ask a question, you will get answers from all different types of people from all over the world; english riders, western riders, show people, trail riders, ranch people, new owners, experienced owners, novices, and trainers.
You'll see a lot of debate amongst members about the right and wrong way, what's proper and improper, what's moral or immoral, you just have to learn to read it all and absorb something from every post, whether it's an example of something to try or something to never
At the top of almost every section of this forum, there are threads that have been "stickied". They contain some really good information about everything from tack to training and would likely be worth a read. You don't necessarily have to read every single post in every thread (because some of them are exceptionally long), but the original post and some of the ones directly behind it contain great information.