3) Slider with ‘featured’ posts still doesn’t work. ‘Featured’ tag addeed to post does nothing.
Could you provide links to the posts you’ve tagged with “featured” so I can take a look? Each post must have a featured image at least 1440px wide by 400px high.
4) How can I manage the content in the black box just below featured image on single post view? I want there to be posts chosen by me – for example only with specific tag. As far as I can see there are all previous post right now.
That are is called the mini-carousel, and any posts (other than the current single post you’re on) with a featured image should automatically appear there. It isn’t possible to specify which posts you want to appear there without major theme modifications.
5) I see some ‘water marks’ on featured images on the main site. On demo there are a few kinds of them (a pin, photo, video, text) – how can I choose one of them or just delete it when I want to?
It sounds like you’re referring to the post format icons overlaid on the thumbnail images. To remove the post format icons, you can try adding this to your custom CSS or child theme:
#main .format-video .single-thumbnail a:after, #main .format-standard .single-thumbnail a:after, #main .format-image .single-thumbnail a:after, #main .format-gallery .single-thumbnail a:after, #main .format-quote .single-thumbnail a:after, #main .format-status .single-thumbnail a:after, #main .format-audio .single-thumbnail a:after, #main .format-aside .single-thumbnail a:after {
content: none;
}
Since you’re already using Jetpack, an easy way to add custom CSS is to activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.