Don't work under managers who are insecure.
Don't work under managers who are insecure. They will not allow you to grow. If you happen to work under one of those kind, get out ASAP. Working under insecure managers should be your last resort. To keep their position they will try all dirty tricks, from keeping you away from relevant meetings, emails, to taking undue credits, creating instability, and creating an environment of unhealthy competition.
Explanation for the image above. The manager keeps fooling the employee by saying "just one more block and I will lift you up" but this just one more block never ends.