How to use tags in Google Keep

I use emojis to classified tags. For example:

• ☑️ for reference information: infographic, login credentials/ID/contracts/hospital results, checklists, etc. They are meant for unexpected/urgent situations, because your memory is very poor for these things.
• 📝 for brainstorming & braindumping: app feedbacks, long Reddit posts/Stack Exchange questions/emails, untold words, etc. They are meant to be deleted after the job is done, because you don't need to remember them.

Here is the screenshot of the tag list

Some people may prefer using alphabetical sorting in the tags. They use A01, A02, B01, B02 before the tag names. Some others may prefer "folders". They create a tag for Web Dev, and another tag for Web Dev/CSS.

You can also have secondary tags in the title. By using this you can avoid the tag-blowing by tagging too much. You can mark it with [], -, or :. For example, the title for this post maybe rGK: How to tag. These secondary tags are best if you are drafting several posts to one same target (subreddit, Stack Exchange site, person), and want to easily search for them, but don't want to create unnecessary tags.

Remember to rely on the tag structure, not the search function. Sometimes you know that you have noted a thing, but you can't search for it again because you only remember its synonyms. What's worse is that you can't remember the word at all, because of the tip of the tongue phenomenon.

If you need to have a more complicate structure, then use another apps that emphasize on structure and organization (I recommend OneNote).