Kindly open up new threads for additional questions as it will help us to focus on each issue and give you a better support which you deserve. Having a long thread makes the maintaining job harder and also it will be harder for the other customers to find the correct information if they have similar issues. You are always welcomed to reply to this thread to follow up the same question.
Now to answer your question, for the top Grid section you can use the Essential Grid plugin.
For the lower sections, you can add a section for each case and set a background and add a parallax effect. The inside content can be mixture of the Image, Text and Button elements.
To know more about the sections:
To know more about backgrounds please watch the background video here:
Finally, I strongly suggest that you read Cornerstone/Content Builder and Elements section articles of our knowledgebase to get more used to how our theme and content builders work: