The writer of Hebrews starts off by telling us Jesus, and Jesus alone, has been prepared and perfected for this saving work in a way no one else has or could be. And any follower of Christ needs to be able to treasure this truth thoroughly and feel its wonderful weight.
The reason Christ alone can bring sons and daughters to glory is said to be He fully enters into the suffering of our fractured, fallen humanity - "...should make the founder of their salvation perfect through suffering" (2:10). That's all the verse says. What this suffering was is the theme of the following verses. Verse 11 begins the unveiling of just what kind of suffering Jesus experienced and how His suffering benefits the likes of us.