Most "serial keys" you find on public forums or keygen sites are:

This is the most cost-effective way to get Photoshop legally. It includes Photoshop, Lightroom, and 20GB of cloud storage for a monthly fee that is often cheaper than a single movie ticket.

Some sites ask for personal information or credit card details under the guise of "verification" before giving you a key. Why Photoshop CC 2018 Specifically?

They have already been blacklisted by Adobe's activation servers.

Check your "hosts" file to ensure no malicious redirects were added.

If you need Photoshop but don't want to risk your system’s security, consider these options:

Many sites claiming to offer these keys require you to download "activators" (like amtemu or universal patchers). These files are often flagged as Trojans or ransomware by antivirus software because they modify system files.