Fix some errors and make some changes to my bigcommerce store

I need the following changes made to my big commerce store (Roots theme):

1. Fix the error appearing under the "Why shop with us" section. In the mobile view, it appears incorrect instead of a straight banner?

2. I need to reduce the size of the gaps (Shown in blue)

3. Make 4 columns instead of 2 for the product categories on the home page

4. I need a new shop by brand banner across the page in the same area of the current "shop by brand" button. I want one similar to the image i have attached where the brands appear as a carousel that has images of the brands.

Thank you very much

Please tell me your price, I just put $30 because I don't know what to charge - Please feel free to send me your quote.

Warm Regards