Challenges With Implementing DDD

I have finished reading the DDD books by Eric Evans (blue book) and Vaughn Vernon (red book) and would like to write my personal takeaway notes of challenges implementing DDD.

Although all original ideas come from the blue book I would admit that the red one gives more understanding of how you can apply the DDD approach. It is not a surprise as the blue book was published in 2003 so it naturally feels a bit outdated in the case of provided examples, but nevertheless, the ideas of DDD are the same in both books.