This is a great topic, 'cause no matter where you are or how old you are, there will always be some "smart" person who thinks they’re a superhero, and it’s easy for a small insect sting to scare you more than you’d expect.
Your friend is very lucky to ask you because you covered the topic quite well; I don’t even think Google explains it this well. Basic knowledge of first aid is always useful; it’s something that should be mandatory in schools.
In my case , I have some first aid kits at home, but that’s because I’m fortunate to work in a hospital; otherwise, it can be quite complicated here. Besides that, the healthcare system is so messed up that I prefer to treat my family at home. For me, it’s an important topic, knowing that almost anything can be deadly 😕
Thanks mate, it's an important topic to those who want to be prepared and it's those who want to be, and are, prepared that save the day for people who are not. It's far easier to neglect it but that puts people at greater risk; I'm not a parent but I would have thought any decent parent would take the time to learn the basics but...nope, so many don't bother.