Hi,
Regarding the SPB Sections.
Step 1
In first place you have to check it the Swift Pagebuilder is active on the SPB Sections.
Go to Page Builder options in the Theme General Options and add the SPB Sections to the page builder post types. Like in the image bellow
https://www.dropbox.com/s/op0kzoayz5nq9ye/sections_step_1.png?dl=0
Step 2
After that you must create a new SPB Section that is available on WordPres Dashboard menu.
Add your desired Page Builder elements and save.
https://www.dropbox.com/s/6wfvhfh1gffixkz/sections_step_2.png?dl=0
Step 3
Go to the page where you want to use a SPB and add it to the page. Edit the SPB section and you will have a dropdown with all the SPB sections that exist, choose your desired section and it’s done.
https://www.dropbox.com/s/zaymh0ojoer1yjz/sections_step_3.png?dl=0
https://www.dropbox.com/s/dysfib1pzk8cykv/sections_step_4.png?dl=0
This is very useful to group blocks of content that are similar between pages. Then you just have to update the SPB Section and all the pages that use them will be updated.
Let us know if you still have doubts.
-Rui