So far, Lazy Blocks has been the most brilliant WordPress plugin for creating the new custom Gutenberg Blocks and that is why I reviewed it personally in the last year 2019. Lazy Blocks plugin provides total freedom to WordPress developers for creating blocks beyond the limitations, trust me it’s a magic potion.
The only thing they were not supporting was the feature for nesting the other Gutenberg blocks and with their latest update, it has been resolved too. So now you can create a master block that nests other blocks.
So after you have downloaded and activated the plugin, you have to go to Lazy Blocks and click on “Add New” (It’s similar like create a new post). And now add some block information, and then create a control, while creating a control at first you need to add some basic information and next you have to click on type which will provide some choices, and you will have to select “Inner Blocks” from then.. and rest is similar like creating other blocks in Lazy Blocks.