how can i link custom loot tables to blocks with custom inventory?

Try a tutorial on YouToube like NortchWestTreesGaming Tutorials

I was confused at the start, and I searched the web to get nothing, so I sat there through countless trials and errors, but I did these steps in this order to achieve my end goal.

1. I hit create new loot table
2. It will then ask you to create a name, you do not need to name it anything special yet, (That's why you coudn't name it with a '/' or slash). For example my one was Relic_Dirt_Loot_Table
3. Then hit create
4. After it opens the page of the loot table creator, at the top is where you change the 'Loot table registry name:', that's where you add your loot table, to "Block/example" or whatever your loot table type is. For example my one was 'Block/Relic_Dirt'
5. Then click save, however, I found that once saved, you cannot change the directory again, so make sure your spelling and caps are correct, because incorrect capitalized letters do not work.

I hope this helped.

(P.S I made an account just to respond here, lol)