Front End Libraries
Lessons from the CSS language was focused on the language preprocessor - the Sass and on the Bootstrap framework (framework). He is, among others used for RWD design - pages adapted to display on screens of various sizes. Lessons in the field of JS libraries used the React and Redux libraries and their combinations.
Of course, obtaining the certificate did not require completing the lessons, but fulfill five exam tasks:
Build a Random Quote Machine
Build a Markdown Previewer
Build a Drum Machine
Build a Pomodoro Clock
I obtained the certificate in August 2019 and it is available here.