I have collected some of my contributions in this forum on my website and added some small things that I found interesting. Maybe someone here will find them helpful. Take a look and enjoy.
Just follow the link in my signature.

Rene your sticky columns still need responsifying for mobile devices especially phones as I mentioned in your original post. Otherwise everything else is ok

I had a look already yesterday, and I find it very good. A lot of users here will be grateful for that. I noticed the same as Wayan regarding the table. You could let the columns stack, for example.
I also have a page with some goodies that you can find in my signature.

Thank you both for your feedback.
My intention when I made these examples was not so much to show a perfectly styled site, but to show basic solutions to some common problems. Solutions that can be implemented with SD4.
Still, I'll take another look at the sticky layout, Wayan.

If you are going to make things like that available for others to download and put into their website as a working component, then you should really make it so it works & looks good at all viewport widths, because very often the people that download these component things rely on it to work at all widths so all they have to do is change words/images etc

Showing it just as an example without it working at all widths is ok if that's all it's going to be

It's only a friendly word of advice gained from past personal experiences when I used to sometimes make those sort of things for people and sometimes made the same mistake, I then spent a lot more time & effort fixing those things for people who didn't know how than was worth.

Hello Wayan,
Thanks for your advice. I appreciate your it.

Welcome
And now that snippet is looking and working good for anyone that may want download it and use it on their own site