IEOs and ICOs are just as risky, but If I had to choose between the two, I would prefer the top IEO in the market because there is less risk of fraud compared to ICOs. The IEOs listed on Binance are successful and have attracted more market investment as well.
all the methods you mentioned do have their respective risks but so far without the courage to face risks it will be very difficult to get profit, as well as for trading that still has risk, the most important thing is to be able to get profit you have to be careful in choosing steps and learn all the cryptocurrencies available and don't be afraid to try something new so it will provide a very important experience.