Great OSINT Training
As I began learning more about OSINT, I discovered some great FREE training. The website My OSINT Training was created by Micah Hoffman and Griffin Glynn This site has some great FREE training, as well as more advanced paid courses.
There is a wide variety of courses, including Social Media, Operational Security (OPSEC), Reverse Image Search, People Searching, Email Searching, Using Breach Data in OSINT, etc. There are many more courses with prices ranging from $25 to $999.
If you want to sharpen your skills in OSINT, I highly recommend My OSINT Training. Micah and Griffin are great guys who are passionate about what they do and you can see it in the way they teach.