Need help creating ability tree

Hello all, I created a few abilities using unity's abilites with with scriptable objects turorial but I want to make a system to unlock abilities and select a learned ability to cast. I searched google but nothing pops up so if anyone could help on where to start or find a good tutorial that would be awesome thanks in advance.

 

Sorry to say, but I don't believe you. I typed 'unity abilities...' And google not only gave auto complete suggestions, but brief search resulted with tons of results. Including videos.