Okay, that page is different from the mod page I found, but the mod I was says it requires Mod Forge and I don't have that or know how to get it. Or at least get it without it wanting me to download 5 different things.
Forge you can get from here (this is the official Forge site, mind the ad site part, it's why modded players use third Party Launchers like Twitch or MultiMC usually to get Forge without having to do the 'ad site' part):
Forge is what you use to make mods run well together/with Vanilla (the standard Minecraft game).
Mods can be gotten from many sources, but like with the user above, Curse is the safest place to get mods from, as other sources are 'mod repost' sites and are dodgey, by stealing mods, sometimes manipulating them apparently (from what I've heard at least). And those sites make claims like '1.13 Forge' when it's not public yet and I know because I support the 1.13 and 1.13.2/1.14 snapshot modding environments so I know 1.13 Forge isn't public yet. While for 1.13/1.13.2 Rift is available, and for 1.14 snapshots Fabric is available.
Anyways, besides getting off topic. Curse.com, minecraft.curseforge.com and curseforge.com are pretty much the same in a way, but have a different visual look and purpose but still fit under 'Curse', they allow for safe Minecraft mod/community content hosting as well as downloading and are usually recommended for community content. Unlike the MCForums where you have google drive/dropbox/mediafire downloads or adfly redirects to those cloud drive services of that creator of adventure maps, mods and so on which can be disappointing sometimes.
I use the exact link the above user gave actually, so definitely use that one. minecraft.curseforge.com/mc-mods
If you want a modpack to make things easier go for those where users have create a collection of mods for users to jump in, install, and go. Compared to other users that make custom modpacks and do whatever they feel like from testing to doing all sorts of normal Minecraft/modded capabilities.
Either way, for Forge it's best to get a tutorial to guide you, but it's still pretty easy to do either way, even between versions of Minecraft. For installing Forge, considering Minecraft versions, modded Forge profiles of the game compared to the main game's version profiles. That sort of technical but still rather simple stuff to do I mean.
The one thing to keep in mind though is the 'mods' folder in your .Minecraft once Forge is installed though, you need to give mods a version folder. Like 1.10.2, 1.11.2, 1.12.2 and put the required versions mods in those so Forge can tell compared to wrong versions and mods being everywhere and hard to tell what's for what.
For the amount of times I come across threads like this, I feel I need a tutorial on Forge I created myself to just post instead of finding one all the time. (Not that it's a bad thing, just knowing which tutorial to get is awkward for me, there's so many, unlike Rift & Fabric which are so niche you need tutorials to be sure just encase).
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'Niche Community Content Finder' for fun and support of creators. I just swim through my 'Experimentation Pond' of content that intrigues me or really needs a bit of acknowledgement or bug fix testing/reporting.
Creator/Maintainer of Fabric, Rift & Tesla Mod Discussion Threads/Niche Mod Youtuber.