Hello, I already made my component, but I'm not sure how to change the homepage, I looked in the documentation. I can only create pages with the user logged in. I use
ossnregisterpage

Yes, every Ossn update will overwrite the /system directory.
And yes, you can realize your changes and ideas by developing your own component.
Study the already available components and you'll find that none of them is creating/removing tables because the Ossn database layout is flexible enough to store custom attributes by simply creating new relations.

Hello, thanks for reply. I am php developer, my question is whether I can add tables to the ossn database and can I change the homepage? I need to remove some fields and add others, can I do this using components? I saw that the files are in / system and I believe if when I update I will lose my changes

1. Re creating database tables
   please understand that this forum wasn't meant to teach basic database or PHP programming. Simply search the web for 'php and mysql' and you'll get a lot of helpful information
2. Re developing a different Ossn initial page please read
   https://www.opensource-socialnetwork.org/wiki/view/1063/how-to-develop-a-new-theme