Grab a book and relax, these ones are the best security books (in my opinion).
- Web Hacking 101
- Breaking into Information Security: Learning the Ropes 101 - Andrew Gill
- OWASP Testing Guide v4
- Penetration Testing: A Hands-On Introduction to Hacking
- The Hacker Playbook 2: Practical Guide to Penetration Testing
- The Hacker Playbook 3: Practical Guide to Penetration Testing - Red Team Edition
- The Mobile Application Hacker’s Handbook
- Black Hat Python: Python Programming for Hackers and Pentesters
- Metasploit: The Penetration Tester's Guide
- The Database Hacker's Handbook, David Litchfield et al., 2005
- The Shellcoders Handbook by Chris Anley et al., 2007
- The Mac Hacker's Handbook by Charlie Miller & Dino Dai Zovi, 2009
- The Web Application Hackers Handbook by D. Stuttard, M. Pinto, 2011
- iOS Hackers Handbook by Charlie Miller et al., 2012
- Android Hackers Handbook by Joshua J. Drake et al., 2014
- The Browser Hackers Handbook by Wade Alcorn et al., 2014
- The Mobile Application Hackers Handbook by Dominic Chell et al., 2015
- Car Hacker's Handbook by Craig Smith, 2016