public class ModBlocks {
    //defferedRegistry
    public static final DeferredRegister BLOCKS = DeferredRegister.create(ForgeRegistries.BLOCKS, modclass.MOD_ID);
    //and now the registerobject of a block
    public static final RegistryObject NAME_BLOCK = BLOCKS.register("name_block", () -> new Block(Block.Properties.create(Material.MATERIAL).sound(SoundType.SOUND).hardnessAndResistance(hardness, resistance)));
    //replace NAME_BLOCK by the name of your block (always in caps) same with the register but with no caps
      //replace MATERIAL by the material name, replace SOUND with the sound name , replace hardness with the Float of hardness value, replace resistance with Float of resistance value
      //you can allways add more things for proprieties
}