cmd+O (search class)cmd+shift+O (search file name)cmd+alt+O (go to symbol), then hit cmd+y to get a preview, hit enter will jump to the code.
by ctrl+clicking a method name, you will be redirected to its definition.
for a html file, type"!"then type"tab" key will give a basic html5 template.
for flask project, in the .py file, type'flaskp' and hit "tab", will give you the definition of post method.