Blog page grid view and featured image and video sizing

Hi Developers,

I have two questions to you!
1. Is this the only view for your blog, the simple one-after-the-other blog posts?
I would like to create a grid view or a masonry style for my blog page? Is there any sort of possibility to do that?
2. The featured image and picture are HUGE and I cannot seem to find anywhere, where to control the height and width of the featured items in the blog post!?

Thank you in advance for your help!

Kindest, Boti