As someone who knows nothing of the lore, it's feeling increasingly like most of the show is flying over my head. I don't know what ring wraiths are, or blue wizards, why numenor is a big deal, and have no reason to believe that anyone will turn out to be Sauron, and wouldn't really understand the importance if it occurs. But those mysteries and potential future reveals seem to be important, so I feel like i'm missing a lot.
You're not, really, missing much, not yet. Much of what people are discussing in these threads has not come up in the series as of halfway through the first season, and
may never do so. You don't need to know about some of those things, may never need to know about them to understand the series, and therefore the scriptwriters have, wisely, not mentioned them. (Other things, in my personal opinion, they should have mentioned or at least explained more clearly. But that's a whole different discussion.)
For instance, the Blue Wizards. They may not appear in this series at all, for all the speculation by viewers that the Stranger may be one of them. (I will also mention that a lot of what people are talking about here and elsewhere may not come from the books
or the movies —that is, these things
are mentioned in the books and/or movies —but for many people interest may have been sparked by encountering them in video games based on Tolkien's work, with lots of details invented by the games' designers. And knowing what there is to know about the Blue Wizards—even should one or both of them turn up in this series— might not make you much wiser, since Tolkien said so little about them. Of course what they may have been up to in video games, someone like me who knows quite a bit of the lore but has never played any of the games, could not even begin to guess.)
The ringwraiths are the Black Riders, also known as the Nazgul, from The Lord of the Rings (books and movies, and probably a great many video games as well). Although in the books they are not called Nazgul until they take to the air atop their monstrous beasts. But you don't need to remember any of that from the movies just yet, because for the series they won't exist until the rings of power are actually forged (likely not in this first season) and Sauron has given nine of them to mortal men, who will eventually (it never says how long in the books) be turned into wraiths/Nazgul.
Naturally, a lot of the people posting in these threads are curious about who those nine men (and maybe women) will be. Are they characters we have met in the first half of season one? Characters we will shortly meet? Individuals we may not meet for a few seasons, and never will know well at all before Sauron traps them with his nasty rings? Naturally it will be more dramatic if they are characters we've been acquainted with for several episodes and feel some sympathy toward, which makes it seem like that will be the most likely thing to happen. So participants in these discussions are interested to know which of their favorite (or unfavorite) characters these will be. As of this point, though, there have been few human characters seen in prominent roles, and with some of those, we already know via the Prologue in "The Fellowship of the Ring" movie what their ultimate fates will be, ruling them out. At this time, a lot of that particular discussion therefore centers around a couple of characters, Halbrand and Theo, both original characters for the series, so if you have been watching all of the episodes to date you know as much about them and how easily (or not) they could be corrupted as the most expert Tolkien expert on the internet.
Sauron was the Dark Lord in the LOTR movie trilogy, seldom seen, and when he was it was only (possibly metaphorically) as a giant fiery eye atop a black tower. All you need to know is that he is the baddest of all possible bad guys by the time the second age rolls around, but as of the beginning of the series he has been lying low for a few centuries and some of the characters choose to believe he is gone for good. But again, if you've seen the prologue in "The Fellowship of the Ring", it's no such luck. He'll be along soon. What you might not know is that before ... certain events we also expect to be seeing in a season or so ... he was a shape changer. Thus, at this point he could be any of the new characters, though some are more likely than others. In these discussions people are amusing themselves by guessing who. (In fact he may not be any of these characters.)
So, all I can say is, if you don't know something that sounds important because other people are discussing it there are three (not mutually exclusive) possibilities: 1) it's not relevant to the story 2) it will be relevant to the story eventually but it hasn't been introduced yet because by the time it does become relevant most viewers would have forgotten it 3) maybe something did slip past you, but we can hope that by the time it becomes important there will be further hints and reminders.
But if there is anything you want explained, there is probably someone here who will be glad to give you an answer (possibly several someones, though in that case there
might be several contradictory answers).
Maybe we need a thread that explains some of the important information that the prologue to this series leaves out. Someone (maybe me, since I a moderator, though not usually involved in the TV forum) could give a bit of background information, and after that people who have questions could ask them there, and those who have the answers could respond. Would there be enough interest? Would it make understanding/enjoying the series easier? I mean, the series really
ought to be able to stand on its own, but it's not going to be
allowed to stand on its own, what with all the news and magazine and internet articles giving information and opinions, Youtube videos where Tolkien fans share what they know (or think they know—I mean, some of them
are quite expert, but that is not true of all of them), and the lore that inevitably gets brought up in these discussions to back up our various opinions. So if people are confused by all this, would it help to a have a centralized place to look for information to clear some things up?