When you need a notebook to jot things down in it's easy to just grab a lined notebook or one with blank pages. There's a third option to consider that has the benefits of both styles: dot grid.
Dot grid paper is exactly what it sounds like; paper with a grid made out of dots on it. The dots are typically spaced 5mm apart.
The simplest reason to make the switch is that dot grid paper is less busy than ruled paper while still providing you guidance to stop your writing from wandering off at all angles.
It's also remarkably flexible, allowing you orientate the page differently if you need to or to write in larger lettering without lines appearing through everything. The dots serve as handy guides for tables too, spaced close enough together to be useful but far enough to still have room to write.
Dot grid paper is quite popular for bullet journals as the flexibility makes it easy to make to-do lists.
Look up #bulletjournal on the social media platform of your choice, and you can feast your eyes on a sea of neatly inked notebook pages designed to track everything from daily to-do lists to inspirational quotes. Go ahead, roll your eyes. But bullet journals are an amazing productivity tool, if you can learn to adapt them to your life. No coloured pens required.
Officeworks, Typo and Muji all stock affordable notebooks with dot grid paper but you may have to ask for help finding it. Otherwise you'll have to look for high quality brands like Rhodia, which costs considerably more than most people are comfortable paying for paper.