The same is true in the writing world. There are so many do this/don't do that scenarios that a person can go crazy trying to assimilate them all. Furthermore, it would be impossible to do so, because the advice is going to be different depending on who you ask.
For instance, there's the whole adverbs debate. On one side of the argument are those who will tell you to avoid adverbs at all costs, like they're some sort of poison for your writing. But on the other side are those who think that, used in moderation, adverbs are a useful writing tool.
Then there's the argument over dialogue tags. Some claim that a few different tags (shouted, whispered, etc) are fine, again used in moderation, while others think you should only ever use "said."
You'll even hear differing opinions about how to write. Some are plotters and some are pantsers, and there are even some who use a little of both. And in each case, I've met those who swear that one way is better than the other.
And then you've got the whole discussion on how to publish your work. Do you only go the traditional route and find an agent? Or maybe you try the Indie publishers. Then there's always self-publishing on Amazon.
There's a lot more advice that I couldn't begin to cover here in one blog, and every writer will hear both sides to each argument, depending on the day and to whom they're speaking. And it's not only fellow writers that you'll meet at your SinC meetings. There are scads of books written by well-known authors designed to give you their tips and tricks on how to write. Stephen King, Sue Grafton and Janet Evanovich are the ones that immediately come to mind.
So, what to do?
Well, as with any advice, you need to keep the kernels that work for you, and ignore the ones that don't. That's hard to do when you're just starting out, because you want to succeed, and you're being given this advice by published authors. They've obviously done something right, but maybe it just doesn't sit well with you. When that happens, try to remember that their "something right" was right for them. It might not be right for you.
There's also the possibility that it's just not right for you at this time. I've received advice in other areas of life that I've heard multiple times over several years, and it wasn't until I was in a certain place in my life that I was ready to follow said advice. Maybe I'm just stubborn, or maybe I had to experience other things first before I was ready.
Bottom line, be true to yourself. By all means, pay attention to every bit of advice you hear, because there are some gems of wisdom out there, and they're being given to you by people who want you to succeed. But don't drive yourself crazy by trying to follow them all; there's no way you possibly could.
There is one piece of advice that all writers agree on, and I think it's the best one out there: Write, Write, Write!