So I've decided to look at YT for tutorials for ST's level editor and here I'll be posting links to the ones I've found useful. @Mods I'd be glad if it gets pinned as it may be useful for new level makers, especially since Wiki is outdated on the subject matter (both Editor Guide and Editor FAQ refer to old editor there).
https://www.youtube.com/watch?v=gsuKAy18iWo
https://www.youtube.com/watch?v=mhSNateb4nI
https://www.youtube.com/watch?v=NLWhteLNcC8
https://www.youtube.com/watch?v=WBdwwcLD-vw
https://www.youtube.com/watch?v=UoaGDuBax6E
https://www.youtube.com/watch?v=lL3oZbPfw08
Not putting these as embeds because I'm conscious of the bandwidth of the unfortunate people who have to live in the USA and deal with Comrizon&T BS (YT HTML5 player is kinda heavy), but feel free to check these out.
And Oliver, I know you're here and you'll most likely check this thread, please if you are to record more tutorials, change language to English, at least for the recording (I don't really care what language you play ST normally in), you'll do everyone a favor. Like it or not, English is becoming world's "universal language," even beating Chinese in China in some areas, especially tech-related. I don't like it either, but it's a fact.
Note regarding the tutorials: There are many 0.1.3 tutorials on YT, but I didn't put them here as they may contain outdated info and are potentially confusing because of that. Looked specifically of 0.5 tutorials.