Fantasy writing requires imagination and the power to create a world within a world. Not to mention, that inspiration needs to translate into the craft. Here are the tips for how you can write fantasy below:
Always start with the plot as the foundation of your process to help you be firm with the setting while brainstorming.
Creating a world is of the utmost importance with details about characters, infrastructures, culture, language, abilities and much more.
Make your fantasy relevant to the world and real-life values and challenges.
Write to create a new world for an audience
Create rules, boundaries, limitations and tragedies of these worlds
Always stick to the rules made in the world you create while writing or else it will be unconvincing and immature
Have conviction in characters and in their motives. Introduce them at regular intervals, not all at once.
Learn from successful fantasy franchise like Harry Potter or The Lord of the Rings