[Learn] Do not cover your ideas

Remember at school other students preventing you from seeing their answers by placing their arm around their exercise book or exam paper? It's the same at work, people are secretive with ideas. 'Don't tell them that, they'll take the credit for it.'
The problem with hoarding is you end up living off your reserves. Eventually you'll become stale.
If you give away everything you have, you are left with nothing. This forces you to look, to be aware, to replenish.
Somehow the more you give away the more comes back to you.
Ideas are open knowledge.
Don't claim ownership.

[Learn] It's all my fault

If you are involved in something that goes wrong, never blame others. Blame no one but yourself.
If you have touched something, accept total responsibility for that piece of work.
If you accept responsibility, you are in a position to do something about it.
Here are some common excuses for failure:
1. It was a terrible brief.
2. I need a better partner.
3. There wasn't enough money to do it properly.
4. The director didn't listen to me.
5. I was too busy on other projects.
6. I wasn't given enough time.
Most of these grievances are every day one very job. That won't change.

The point is that, whatever other people's failing might be, you are the one to shoulder the responsibility.

There are no excuses.