Check the Featured Post block settings
By default, your home page will spotlight the latest published post. This will update your homepage automatically. But it's possible to choose a specific post to be pinned.
For that, you'll need to:
Edit your homepage;
Select the Featured Post block;
Toggle off the “Show latest post”;
Copy paste the title of your article on “Search for a post”;
Select the post that will appear
Check the gif below:
Latest Posts Block
You can also add a set of posts filtered by Categories. This is called Latest Posts Block:
On the block selector, scroll down until you see Indie Tech Blocks section
On the right side menu, under block settings, select the Categories to be displayed
You can also select the number of posts and which elements will be displayed: