Now you have an idea what a niche is. The next thing you should do is to write down 5-10 things you like doing. This could be a hobby, something you want to learn or maybe just a topic where you have a strong opinion. The first site you create should be about something you are passionate!
Write down 5-10 things right now and then go on reading! I really want to help you picking a niche, so just write down your thoughts.
Now pick 3 of your favorite things on the list and again write them on a peace of paper.
Think about this 3 things and imagine about which topic on your paper you could regularly write new content and don't get bored. This is important if you want to succeed. You need a topic that writing about motivates you!
It's just important to start! Start writing and you will see which one is the right choice! And don't think about monetization. You can do that later on!
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Your audience should be interested in 'buying' something from you so I am not sure how you could monetize a Christian website really...
Unless your main goal is not to make money from your website I don't really see how you could do that
