There are several free training courses on various fields of cybersecurity. Below are some free sources to gain expertise in cybersecurity.

• Professor Master
• [Cybrary](https://www.cybrary.it/?)
• VulnHub
• ACI Learning

Additionally, some companies also provide free training on cybersecurity.

• AWS has Skill Builder which has many things in a free tier of courses and AWS Educate
• Azure
• Splunk
• Coursera has a CyberSecurity MOOC powered by Google, It is paid, but there's a free trial and you do it at your own pace: CourseraCyS
• Darknet Diaries produces audio stories specifically intended to capture, preserve, and explain the culture around hacking and cyber security in order to educate and entertain both technical and non-technical audiences.
• Also there are lots of cybersecurity crash courses on YouTube. **Edureka’s** playlist is a good start for beginners.