Strategy guides for RPGs are irrelevant. For a game that is all about exploration, you're spoiling yourself with something like that.
The older the RPG, the less obvious the game makes it's crucial information. Xenoblade Chronicles already did a good job communicating skills and materials, this game looks to have further streamlining. If you don't want to invest yourself in the atmosphere, gameplay, and overall experience of a game, or rather, wish to speed through it, you're not getting your money's worth, or you aren't really all that fond of the type of game the developers created.
I'm not, and never will be a fan of character action games, or 2D action platformers. So I try to avoid them. I'm a fan of complex combat systems, lengthy narratives, and large worlds, so I gravitate towards RPGs. I find it ridiculous and a bit insulting that Nintendo explicitly said "if you like Zelda or Metroid, you should give this a shot," because they are so fundamentally different. Not everyone is going to enjoy Xenoblade Chronicles X. RPGs are a niche genre, and this specific style of RPG- essentially, an offline open-world MMO, is going to appeal to even fewer people. The recent trend of simplifying and streamlining the mechanics of RPGs and putting emphasis on amount of quests and not the depth or variety of them is an attempt to make the genre more accessible and mainstream, which is pretty much the exact opposite of what the genre is. Xenoblade Chronicles X, however, is not a mainstream RPG, despite Nintendo's attempts to convince us otherwise. Or naybe they do know, since they haven't been advertising it at all and are effortlessly telling people that like games in different genres to check it out.
TL;DR play at least 40-60 hours of XCX before considering getting a strategy guide. Also, I hate video games.