Hello, @Thekoki,
To create an attribute filter, you must first add a new attribute under Dashboard > Products > Attributes, as per your needs.
After that, please navigate to Dashboard > Appearance > Widgets and add the 8theme Swatches Filter widget to the shop sidebar, selecting the attribute as per your requirements. For a better reference, please see the image here: https://postimg.cc/XZcf1dFQ
In order to search by brand, you will need to add the 8theme Filters Products by Brands widget to the shop sidebar as per your requirements. Please refer to the image provided here for further reference: https://postimg.cc/GHgzCF42
For further reference, please watch the following video: https://www.youtube.com/watch?v=LgzC4iK-j6A
Best regards,
8Theme’s Team