An Admin Theme should be Organized and user-friendly so, components are easily accessible.
Principles behind the birth of Claro
A confident, Precise and Strong Contrast theme
Predictable patterns and react to inputs
Room to breathe, while avoiding sterility and emptiness
Claro is Upcoming default Admin Theme for Drupal 8 Which is said to be designed with clean lines, simple blocks, and sans-serif font to emphasize the tools and tasks at hand.
Claro uses the base theme as classy, various template overrides are being made in this template which includes overrides from Admin, block, filter, form and navigation.
Advantages and Topics of Discussion include:
Why is Claro Different from other Admin Themes
When and When not to go for claro as Admin theme
Creating a custom sub-theme from Claro.