Topics Entries: Use short one-line entries with the recommended notation [tags] to keep notes, events, and tasks recorded quickly.
This works great in tandem with Onetastic's One Calendar tool [ so you can check each day's notes instantly.
If it's a specific topic, however, use the title space - it will help when searching for these entries. with many spreads, pages, etc.), consider creating a section with its name.
The template uses an A4-sized small-squared page lines with landscape orientation and a division line.
Ready for printing / and or using it digitally (if so, I'd recommend using automatic size page but keep the split line).
You could even group them in subpages to avoid creating sections for topics somewhere between simple (one-page) and complex (one-section) ones.