Nothing is really ever obsolete. I have run adventures from the 1980s and adapted them to 5e. It's easy to do. All that changes are the stat blocks. The stories are the same. Everything is reusable, again and again.This is what I needed to hear/read. I already knew it, but I second guess myself constantly. I can always play 5e and whatever 6e/5.5e/etc. ends up being called. I know I like 5e so why not play it?! Thanks for the nudge I needed.
Sounds like you have the basics. Lost Mine is FANTASTIC. I have said this in the past, but it ranks up there in the top 5 adventurers of all time, in any edition of D&D. If you take Essentials and cherry pick it to add flavor and new encounters to Lost Mine, you will have a super robust adventure. If you want to add a full city adventure, like I mentioned, find a copy of Neverwinter from 4e. It is a great sourcebook and really fleshes out the area. Between all three, you will have more content than you know what to do. I ran Lost Mine twice. If you want to read some of adventures, I have them on my blog here. The first is the better one; it is blended with Essentials. We didn't finish it sadly though; Covid came and ruined everything.I figured out the quotes!
Anyways, I recently saw a Curse of Strahd coffin shaped box at a gaming store. Can you please explain what this comes with? What is the benefit of buying it? Or is the book perfectly sufficient?
Btw, so far I have bought the Essential Kit, the Starter Kit, the Expanded Rules alt art set, and the Stranger Things Starter Kit. I have yet to play any of them though.
These responses are great, everyone! Thank you very much for the advice and information.
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I figured out the quotes!
Anyways, I recently saw a Curse of Strahd coffin shaped box at a gaming store. Can you please explain what this comes with? What is the benefit of buying it? Or is the book perfectly sufficient?
Btw, so far I have bought the Essential Kit, the Starter Kit, the Expanded Rules alt art set, and the Stranger Things Starter Kit. I have yet to play any of them though.
These responses are great, everyone! Thank you very much for the advice and information.
I know that no one knows for sure and this will all just be speculation, but do y'all think the 6e (or 5.5e, etc.) will be mostly made of slight tweaks to 5e instead of more of an entirely new edition? I've been lurking all day and it seems most think it'll just be incremental.
I ask because I began playing a couple of months ago and I love it. I tend to jump in head first when I find a new thing I really like so, of course, I'm looking to buy some books, but I don't want to invest much money into 5e books if they are just going to become outdated. I know that WotC says 6e will be backwards compatible, but I'm still kind of worried about it.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.