I used Rocket Launcher on the WP attempt, which I ended up completely deleting before starting over with Joomla in hopes of that being easier.
I have switched to Joomla 3.8.4 / Ambrosia, used RocketLauncher and still cannot recreate the home page. But yes, as Ryan wrote, that is how I've always done it...used the template as is, added my own content, deleted what I didn't want and added what I did want.
And that is how I also do it, unless I am removing more than I am keeping in which case I use a clean install with template. I also have a RocketLauncher as a local install so I can explore if I get stuck.
I'm trying to go through each module and particle setting as per documentation. 1st: Header: Documentation shows: System Messages in green. Below in blue: Logo 25% (settings icon) Top Menu 75% (settings icon).
On my backend, what appears is: System Messages in green. Below in blue: Top A 33% (settings icon), Top B 33% (settings icon) and Top C 33% (settings icon). And I'm lost.
That sounds to me like you have gone to the template admin and are possibly looking at the default outline instead of the modified Home Page outline. This is the equivalent of having a Master and Copies in Gantry 4 templates. In Gantry 5 the Master is Base Outline, which is usually then cloned to Default. With Gantry 5 you can do the same, although the instructions are different.
When you are in template admin what name does it give at top left of screen? That will be the name of the outline you are looking at.
I look forward in documentation and see Section Header. No such thing in my back end. And I'm lost.
My point is, I need documentation that is simple, chronological and straightforward, not documentation that requires me to read between the lines and not documentation that skips around. After the amount of time that this is eating up, it sure seems that is can no longer serve people who are not more advanced than I am. I assume that has to do with documentation. I've used a number of RocketTheme templates in the past.
If I can figure out Joomla, but can't figure out RocketTheme, I think that's telling.
So let me see if I can help the penny drop for you, because I struggled moving to Gantry 5 too.
Go to templates > styles. Now click on Ambrosia - Home - Positions (It may not exactly say that but it will include Home) and then click on the layout tab.
You can now see all of the current template positions for Home page. Look for the section that shows as Header and on the right you will see a cog icon for settings. When you click that icon you will see the image shown in the documents. This applies to all pop-up windows shown in docs - it will be the cog in the white area for a section's settings, and a cog in blue areas for a module's settings.
I hope this helps to explain why you are getting lost in the documentation. There is an assumption that members will take some time to check the original Gantry 5 documents before attempting to modify the templates. If we put in every single step then the documents would be huge.
Hope this helps