All the basics that you need to know in software testing field, these include:

-Basic theoretical concepts

-Test case writing & bug reporting

-Test management tools (Testlink)

-Agile Testing Basics

-Agile Tools (JIRA)

-Black Box Techniques (Equivalence Partitioning-Boundary Value Analysis-Decision Table Testing-State Transition Testing-Use Case Testing)

-White Box Techniques (Statement Coverage-Decision Coverage-Path Coverage-MC/DC-Loop Coverage)

-Freelance Testing (Bugfinders-Utest-Testerwork-Crossover)

-Automation Testing

-Performance Testing

-API Testing

-Mobile Testing

-Interview questions

-C.V Tips

-ISTQB Certificates