Three simple steps:

1. open(page)
2. $(element).doAction()
3. $(element).check(condition)

open("/login");
$("#submit").click();
$(".message").shouldHave(text("Hello"));

Use the power of IDE

Selenide API consists of few classes. We suggest you stop reading, open your IDE and start typing.

Just type:$(selector). - and IDE will suggest you all available options.

Use the power of todays development environments instead of bothering with documentation!