“following items not to find: in section Services ( where to how to change the icons)”
You can see the html code we added here for service section with the icon FONT CLASS NAME.
Why we need custom code with these class names ? By default, the helix3 framework and sp pagebuilder addon using fontawesome icon that not support the icons for special “niche” like building services.
Where to find full list Icon font “CLASS NAME”? You can see the full list icon font here http://linea.io/
Download full package to your computer, select the icon folder you wish to use then open icons-reference.html for more detail about class name for each font icon, like this https://imgur.com/a/YsQur
How to change the icon font class name?
Example this code
<div class="icon icon-basic-settings"> </div> <h3>Home Maintenance</h3> </div>
you can replace the icon-basic-settings to icon-basic-helm for example, just changing the class name icon and DONE
“Section with titles: Marketing – development – production etc etc with icons where to find and how to change icons”
Go to module manager -> find module name FEATURES and do the same steps above to change icon name.