What are the best security and performance tool as a fresher tester i should know? I am new to the testing field and my seniors have asked me to learn tools for performance and security testing.
There is no "silver bullet" tool which would be the best, it totally depends on your application technologies, infrastructure, your experience in terms of programming languages, etc.
The list of tools is quite easy to to figure out:
However you might want to narrow them down according to your requirements, i.e. take a look at Open Source Load Testing Tools: Which One Should You Use? guide for example investigation