Create a custom block in drupal 8
Blocks are box of content in Drupal, It is like a component and we can place it on a web page by placing it in any region of theme. Drupal provides many inbuilt blocks and you can use view to create new blocks. I believe creating a block using a view is the best method. We can create a block with dynamic content using it. However, the Drupal core system provides an annotation to create a custom block.