skills and techniques are abilities that can be due to continuous practice, Poker is one example..
According to the article you posted;
- Bingo??
- Craps??
- Roulette??
- Lottery??
- Video Poker??
Almost half of the games you mentioned in your blog is luck based game, so there's no skills or techniques needed obviously.
I can't open the link that OP put but The 5 games above are 99% luck + 1% hard work "lol"!!