Tag - Capture the flag
Capture the flag are are challenges that vary in degree of difficulty, and that require participants to exercise different skillsets to solve. Once an challenge is solved, a “flag” is given to the participant and they submit this flag to the CTF server to earn points.
There are different challenges found all over the internet. I usually do the once in Discord. There are also event where you can participate. See the resources tab to find links the Capture the flag challenges and/or events