Rift is the only modloader you need for 1.13/1.13.2, there is no Forge for 1.13 versions, never trust the mod repost sites, never trust the clickbait youtube videos saying 1.13 Forge that I'm sick of laughing at. There are many Rift tutorials online, I even make my own for all 3 launchers (Vanilla/Standard, MultiMC & Twitch unofficially, [found a workaround myself and made a video on it so... I know it's possible unofficially])
Look here for all you need to know about 1.13 Rift and 1.13 compatible mods. You can use Optifine E4 with Rift for 1.13.2 from what I've tried, you just need to 'extract' Optifine by double clicking it and hitting the 'extract' button to make it a mod you put in the mods folder.
'Look Here' Thread for all your 1.13/1.13.2 Mod Information needs, if you want datapacks instead they aren't difficult to learn either but this thread won't cover them.
I update it almost daily if something comes to Rift of need to report to the thread for mod updates or things I find myself that I find interesting to point out. Or just answering people's questions if I can since I'm no expert with Rift, just someone that experiments with it, but as Fabric (for 1.14 snapshots, even 19w02a right now they are that good) I update that more since it's the big mod space right now for small mods. But still.
Just be careful next time, 1.13 Forge will come out soon, but you will know it once 1.13 mods on Curseforge (as one of the safest sites for mods honestly) are more obvious than only the Rift ones or Forge's main site will have 1.13 versions. Never trust mod repost sites.
For now though, it isn't available even though it's getting closer to being released I "assume" soon, just not yet as of right now.
I even made the title of this thread state 'NO 1.13 Forge yet' at the end on purpose to state it's not available yet and I'll change this title once 1.13 Forge actually does comes out.
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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.