One of the main reasons I made this list is because I heard about STOs a few times already but I didn't have a clue what it is. So, I'm not saying you should invest in STOs, but if the market involved into new directions (and it seems in the last few weeks it does) it's important to know what it is.
What is even STO?
All you need to know about STO
What is Regulation and why STO needs it
ICO vs STO who wins?
Security tokens in the US: regulations and exemptions under the SEC laws
The future of STO's
The Pros and Cons of Security Token Offerings
TD;LR Many of the ICOs were actually STOs and even now some ICOs issues token that fit in the security category thus making them un-regulated STO, so this field still Relatively breached, not every STO is regulated and safe, a lot of them are just STOs in ICO disguise. In addition, STO stands for Star Trek Online ground and space building