My genuine experience has been that I found standard bullet journaling too much hassle and pared it down to just what I wanted. I haven’t really got any links to resources but I’ll describe what has helped me (as somebody who is also very bad at making habits):
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Obviously not essential but a nice place to start. You can totally just grab a biro and scrap paper and work away, it doesn’t make it any less journaling. Different people prefer different book bindings, writing implements and paper markings and all that - and what works for you will very much depend on what you’re actually writing.
I personally use the Rhodia Goalbook because it has dot ruled pages (I found lines and grids to be too distracting) and it has numbered pages + a blank index (so very useful for keeping notes about how to do things at work easy to find). An alternative to an index is getting a disc bound notebook, where you can actually reorder the pages but imo they’re pricey and difficult to maintain.
This may be where you fell off whenever you’ve tried journaling. A lot of people put a lot of effort into their journals and many will tell you that their way is the Best And Most Efficient Way. There’s a (imo kinda insidious) culture of Productivity and Instagram-ready perfection that hovers around journaling. Don’t worry about that stuff at all. I put no effort at all into mine. At the end of the day it’s your journal for your reference. Do what is most useful to you without making it too stressful/time-consuming to be worthwhile. But here’s some structural things that have helped me:
An index: reserve the first spread or two of your notebook for an index/contents page. Number your pages as you go, make a note of the title and page number of anything important.
Freedom to skip days: There’s times that I won’t touch my journal for weeks. I used to use a dated filofax and if I missed a day I just felt bad and then stopped all together. The benefit of using a blank notebook is that you’re putting down the dates yourself. If you miss days just write “missed some days…” And carry on like nothing happened.
Daily bullet lists: this is something I stole from Bullet Journaling. If you find it too stressful just do a normal checklist because if you’re like me and are bad at finishing tasks, this could make you feel bad but basically you have the date as a header. if you need to do something you add a bulleted item. If you get it done, draw an X over the bullet. If it’s no longer relevant put a line through the item. The next day put the date as a header again and copy out any tasks from yesterday you didn’t get done but are still relevant. In theory if you keep neglecting to do something you’ll keep having to copy it out until eventually you’ll either do it today or you’ll decide it’s not worth doing and cross it out. Useful but rubs your face in it a bit.