______BlockItemBase.java:______

package com.cb1s.botmod.blocks;

import com.cb1s.botmod.botmod;
import net.minecraft.block.Block;
import net.minecraft.item.BlockItem;
import net.minecraft.item.Item;

public class BlockItemBase extends BlockItem {
    public BlockItemBase(Block block) {
        super(block, new Item.Properties().group(botmod.TAB));
    }
}

______RegistryHandler.java______

package com.cb1s.botmod.util;

import com.cb1s.botmod.blocks.BlockItemBase;
import com.cb1s.botmod.blocks.HeartBlock;
import com.cb1s.botmod.botmod;
import com.cb1s.botmod.items.ItemBase;
import net.minecraft.block.Block;
import net.minecraft.item.Item;
import net.minecraftforge.fml.RegistryObject;
import net.minecraftforge.fml.javafmlmod.FMLJavaModLoadingContext;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.ForgeRegistries;

public class RegistryHandler {

    // 1.16.1 update =
    //public static DeferredRegister<Item> ITEMS = DeferredRegister.create(ForgeRegistries.ITEMS, botmod.MOD_ID);
    //public static DeferredRegister<Block> BLOCKS = DeferredRegister.create(ForgeRegistries.BLOCKS, botmod.MOD_ID);
    public static DeferredRegister<Item> ITEMS = new DeferredRegister<>(ForgeRegistries.ITEMS, botmod.MOD_ID);
    public static DeferredRegister<Block> BLOCKS = new DeferredRegister<>(ForgeRegistries.BLOCKS, botmod.MOD_ID);

    public static void init() {
        ITEMS.register(FMLJavaModLoadingContext.get().getModEventBus());
        BLOCKS.register(FMLJavaModLoadingContext.get().getModEventBus());
    }
    //items
    public static final RegistryObject<Item> HEART = ITEMS.register( "heart", ItemBase::new);

    //Blocks
    public static final RegistryObject<Block> HEART_BLOCK = BLOCKS.register( "heart_block", HeartBlock::new);

    // Block Items
    public static final RegistryObject<Item> HEART_BLOCK_ITEM = ITEMS.register("heart_block,", () -> new BlockItemBase(HEART_BLOCK.get()));

}

_____HeartBlock.java_____

package com.cb1s.botmod.blocks;

import net.minecraft.block.Block;
import net.minecraft.block.SoundType;
import net.minecraft.block.material.Material;
import net.minecraftforge.common.ToolType;

public class HeartBlock extends Block {

    public HeartBlock() {
        super(Block.Properties.create(Material.IRON)
                .hardnessAndResistance(0.2f, 6000.0f)
                .sound(SoundType.METAL)
                .harvestLevel(0)
                .harvestTool(ToolType.PICKAXE)
        );
    }
}


______blockstates\heartblock.json______

{
  "variants": {
    "": { "model": "botmod:block/heart_block" }
  }
}

lang

{
  "itemGroup.BotModGroup": "Bot Mod's Items",
  "item.botmod.heart": "Heart",
  "block.botmod.heart_block": "Heart Block"
}

______block\heart_block.json______

{
  "parent": "block/cube_all",
  "textures": {
    "all": "botmod:blocks/heart_block"
  }
}

______item\heart_block.json______

{
  "parent": "botmod:block/heart_block"
}