Docs: Fundamentals of Block Development - Static or Dynamic rendering of a block

docs/getting-started/fundamentals/static-dynamic-rendering.md

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+# Static or Dynamic rendering of a block
+
+
+
+A block can define dynamic rendering can be defined in two ways:
+    - The `register_block_type()` function includes a `render_callback` argument.
+    - A `render` property is added to `block.json`, whose value points to a separate PHP file (usually named `render.php`).
+
+Blocks can have static or dynamic rendering:
+- If no dynamic rendering has been been defined the rendering 
+
+## Blocks with Static Rendering 
+
+Blocks with static rendering **generate the HMTL for the frontend at "update-time" (when it's saved)**:
+- Blocks with static render use their markup representation in the DB to return the markup used in the frontend for the block
+- The `save()` function writes the block’s markup inside the block indicators (HTML comments). 
+- Only the markup inside the block indicators is returned as markup to be rendered for the block in the frontend.
+- For blocks with static render, the markup returned to the frontend is defined/set when the page is saved.
+
+## Blocks with Dynamic Rendering 
+
+Blocks with dynamic rendering **generate the HMTL for the frontend at "request-time" (when it's requested)**
+- These blocks usually need to display info that is not known at the time the page is saved
+- Dynamic rendering for a block can be defined:
+    - The `register_block_type()` function includes a `render_callback` argument.
+    - A `render` property is added to `block.json`, whose value points to a separate PHP file (usually named `render.php`).
+- Dynamic render methods receive attribute, inner content information and   additional required dynamic site information.