Tags are a great way to look back over posts that feature a certain subject.
Some of my tags include: work, dreams, art, walking, xbox, music, reading, funny, meals out, letters & messages, weight, journaling, finances, sunsets, tech, movies & tv, music, gratitude, covid, current events, christmas, ideas.... the list goes on.
You can view your entries by tags and reflect or gain more insight into a subject, or you could choose to export entries by tag - possibly to create a memoir or to leave memories for your family when you're gone.