-What happens after the "beta" period ends?
-I think the site is still under construction in some specific areas. When that finishes and will be stable i think beta will be removed (as happening to anything beta) . A similar post for more is here
-Steem is an ethereum based token, what is Steem Power? Is it also a token or is it some sort of internal index, where is it stored?
-Read this post . Well written .
-Can you convert Steem into Steem Power and vice versa?
Yes. But steem power is not an instant withdrawal thing. It takes time . If you read the links i provide you will have your questions answered.
You can search for this kind of things (and anything else) in the search function upper right.
Welcome to steemit . Hope i helped . @enterg
Thank you very much! I will read all and eventually ask there more details. The beta phase length doesn't bother me, I am more curious of what happens to the accounts, the posts, and so on. I will dig more..:)!
Check this post also .
The tools list is awesome! Thanks again