Otherwise since I just searched what I thought you might look for. Can you state what version of Minecraft your choosing to view a modding tutorial for towards Custom Blocks and Items? I just choose 1.12.2 since it seemed the most likely, but thought I'd ask to be sure just encase.
Hopefully this search was helpful even though it counts 1.12.2, 1.10.2, 1.9 but I did what I could to make it a simple search rather than too much specifying. Or maybe there is few out there that cover custom blocks than I'd think there would be. I don't know for sure.
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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.