Card blocks are combination of card components and could be used to highlight blog posts, plans, product etc.
Block components consist of simple components (such as buttons, inputs, etc.) and used to build complex structures such as section components. You can combine different blocks to create unique sections.
CABL is primary component name for cards blocks, where CA - cards, BL - blocks and last 2 digits is a sequence number.
Block components should be nested inside of parent wrapper and shouldn't be nested inside of any row, as they already have it. Just select and copy any component from the styleguide and paste them to your project. Or you can search the component's name in the Component panel (Shift + A) or use quick search (Ctrl + E).
Before making any changes you need to unlink component. Right-click on the symbol’s label and choose unlink from symbol. You can style components whatever you like.