A tutorial on the markdown language is here: https://commonmark.org/help/
What I find particularly useful is the for the code blocks - if you type ``` at the beginning and the end of your code, then your code is formatted!
For example, some unformatted code is like this:
#include<iostream>
using namespace std;
int main()
{
cout << “Hello World!” << endl;
return 0;
}
But if you type ``` before the code and after the code, it becomes formatted:
using namespace std;
int main()
{
cout << "Hello World!" << endl;
return 0;
}