Simplenote is suited to short, clear notes that do not need complex formatting or large attachments. Its maintained basic service can cover that role, provided you are comfortable with the lack of a new-feature roadmap.
Keep each note focused on one topic and add a small number of consistent tags for retrieval. Use shared notes for straightforward text collaboration. Export important information periodically, especially because the official help page says the product is no longer in active feature development.
