Well said, NYIntensity.
In any area of life, ask yourself: what does this person actually do? How long have they done it? With what success have they done it? If you don't know, keep asking.
For instance---is the person giving advice fish-only, sps reefer, lps reefer, zoas or other specialty reefer---little tank, big tank,---long experience, 3 weeks in the hobby, etc.
That's why there's that line you can put under a sig where you can post your equipment, your fish, your other stats for people who'd like to check it out.
Don't believe any of us as gospel: I've been at this hobby in one form and another for 40 years. I can say the modern methods are the best we've ever had, but I've also kept things in a 2 gallon glass bowl with a bubbler and a hydrometer...I can't say how long I could have done so, because a neighbor's cigarette smoke got that rig. My next salt rig ran for half a year before I pulled a beginner mistake and killed an innocent anemone. My third tank ran for nearly 10 years before I sold it intact. You just get better at it, and the equipment gets better, but you never have all the answers---and most of us at this hour can't afford the systems that some people are now futzing up to become the new gold standard of equipment. So you try to put together something that will work.
When giving advice you try to head somebody off from the most costly, tank-fatal mistakes---because if you are hurting from buying a filter, that's minor compared with having something go wrong after you've got a whole functioning tank with specimens you're emotionally attached to and have it go south overnight.
These heart-breakers do happen in the hobby: you have only to read the posts. Somebody loses all their fish in a night; somebody loses a coral reef they've worked years to grow. Sometimes the answer is nitrate buildup; sometimes the answer is a sandbed problem; sometimes it's equipment failure, power outage. I personally ran into problems after 10 months because I didn't replace my lights on schedule, and THAT intersected the fact that my skimmer was underpowered for the bioload in my tank---or rather, I was getting a bioload in there BECAUSE my skimmer was underpowered for the systems. So the bad lights/bad skimmer added up to major problems, and in the way of major problems, the situation that had been building up took about 3 days to get critical...NOT critical enough I lost my tank, but it was a scramble, and cost me two pieces of coral.
So, yes. It is confusing. But I can say the equipment you've ended up with won't be bad in the long run. A cannister can be quite useful, when you've outgrown using it as a filter, for cleaning up temporary situations, for running certain things for emergencies; a sump is always useful; the more complex your system gets, the more useful it is; and if you want ultimately to have a complex tank, you're going to push beyond the limits of any hang-on skimmer.
So yes, sympathy from us: it's a lot of info at once, and it doesn't all agree. Make haste slowly toward the vision you have of what you want---all of us tend to have one picture in our heads of what we want our tank to be, even if the specific details are vague. Stay with it, and keep what you've got because you'll probably use all of it sooner or later.