Okay, when it comes to planning the world, follow the plot holes avoiding technique and make sure that you round it all up. 

The technique of George. R. R. Martin is that he rounds his worlds all up. How? let's take Targaryens for an example.

1. House symbol 

2. House motto

3. House colour

4. Hair colour

5. Origin

6. Eye colour

7. Appearance

8. Doom

9. Rise

10. History 

a) Before History

b) After History

11. Special feature (strengths or special powers)

12. Family

13. Weaknesses

14. Area of ruling

15. Current ruler

16. Myths, folklore and conspiracies

Every detail is filled up. This is all-rounding of each house. If you're building a fantasy world, then you should follow this all-rounding procedure. For history, just build up a fairytale like story and add up the fantasy elements. This is why Game of thrones is so successful and also complex. Use this exclusive technique especially in fantasy story writing.

Lastly, if you want more techniques, you MUST check this channel out, she's super amazing person and she has really good tips for you writers -https://www.youtube.com/channel/UC20oEMuKgfaNBfpV7JlFRQQ

If you enjoyed the book, please vote and comment your ideas and follow me (if you admired my tips, I'm also hoping of completing my book in next year I'm so busy these days with school finals) Help by sharing the book to amateur writing friends of you :)

- 💖Bloom💖