Posts are written in Markdown. More specifically, the kind of Markdown that's called Commonmark. We're guessing that you are familiar with Markdown, but anyway. Here are some of the things you can do with it.
Links can take you to wonderful places.
Code can be written inline like this.
if(youWant) {
console.log('You can write code in blocks.');
}
else {
console.log('Whatevs man.');
}
If you want to put emphasis in certain things that's also pretty simple.