Huddle landing page with alt ft #1

So a couple things I feel like I'm not doing right.

1. I feel like when I'm writing my html out wrong, I am having issues later on in the projects where I go back during the media query part and having to add more html for items to be together for Flex.(I start with mobile version first)
2. I had some trouble with getting the middle card to flip image and text for some reason and the footer I had trouble with making it line up the same way they had it on the design.
3. I don't now if I'm doing the social logos at the bottom right. seems i cant get the color of the background white without running into an issue with making the border white again. I have been using filter for the svg logos.
4. I'm not sure if I used the right code for the bottom box where it sits in the middle of the footer and card section. I used position relative, not sure if i was suppose to use Absolute I have never worked with absolute before.
5. I had trouble with the copy right logo lining up and going next to the copyright text if someone could tell me what I could've done that would be great.

Please if someone can assist me on these things that would be great.