There are two routes to creating a new post, the first is a shortcut and the alternative is via accessing the WordPress Dashboard.
'New' Shortcut
Whilst viewing your learning log, select 'New' from the menu bar at the top, followed by 'Post', as shown in the screenshot below.
This will direct you to the editor (Gutenberg Editor) where you can begin composing your post.
WordPress Dashboard
Alternatively, you can also create a new post by accessing the WordPress Dashboard by hovering your cursor over your site title located on the menu bar at the top, followed by 'Dashboard', as shown in the screenshot below.
Select 'Posts' from the left-hand menu, followed by the 'Add New Post' button, as shown in the screenshot below.
Again, this will direct you to the editor (Gutenberg Editor) where you can begin composing your post.
For guidance on how to use the Gutenberg Editor, see the How can I use the OCA Spaces editor to post my work? article.