Do you even need an index and do you consistently create one in your Bullet Journal?
I personally find it very useful, but only since I found a layout that was perfect for me.
As a VIP member, I'll be happy to tell you what that is in this article.
In my Bullet Journal® I mainly write, draw and design with the following products: These are affiliate-links. If a purchase is made via such a link, I will receive a commission. There are no additional costs for you. Where, when and how you buy a product is of course up to you. However, I would be very happy to receive any support.
