What does confident knowledge of algorithms and data structures, OOP, databases imply?

Question

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I want to enroll in courses from an IT company. The requirements say that you must have a confident knowledge of algorithms and data structures, OOP, databases.
What does confident knowledge of algorithms and data structures, OOP, databases imply?
What exactly do I need to know?

Answer 1

Algorithms - types of algorithms of their variety
Data structures - lists,
OOP graphs - apparently, the basic concepts, polymorphism, encapsulation, inheritance.
Databases - relational model, knowledge of SQL, data normalization
What do they teach there?

Answer 2

https://vk.com/wall238974097_580
Preparatory course on algorithms and data structures.