Answer 1

Syntax and basic coding pattern,
Is the basic thing to learn , for this purpose check various code , learn about input output operators, library files , and many more things
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Answer 2

I think C++ basics are these:
1. printing text
2. writing inputs
3. declaring variables
4. Operators
5. If and else statement, switch statement
6. Arrays
7. Pointers and so on

Answer 3

1. Operators.(+,-,/,*,%)
2. If else , switch-case
3.looping (for,while)
4.then array
5.then different library's like using vectors , sets , algorithms , maps..
6. Class , object(OOPS)..
7.So on....