While I appreciate you sharing your experience and questions, I'm afraid this is not the appropriate forum to address your questions. I would strongly suggest searching he
GMail help center and familiarizing yourself with the differences between
POP3 and IMAP. One important note about IMAP as quoted in the previous link:
When a person uses IMAP, and he or she reads, deletes or moves email into folders, the action occurs across all devices simultaneously.
As such, whatever change happens to the email in GMail (including being moved to spam) will be reflected on your local device using Outlook. If the email is deleted in one place, it will be deleted in both. If existing in one place, it will exist in both.
I hope you find answers to your questions with the resources linked above.