Common Terminology
Many of the words and phrases that are second nature to alterhumans morph into esoterica to the outside viewer. I have tried to explain the terms you are most likely to have come across.
It would be accurate to say "if you ask ten people what 'otherkin' means, you'll get eleven different answers". With this in mind, my definitions have been left purposely open and don't gravitate towards any particular belief system.
Alterhumanity is by nature a personal journey and something that ties together many different perspectives from many walks of life. It would be impossible, and rather arrogant, to lay out 'easy' answers here. Going forward, I encourage sitting with vagueness and pushing yourself to develop your own beliefs.