Failing to give proper notice
You owe it to your company to let them know of your plans to leave your role. Not only will they be left in a difficult position but your relationship with them after your employment may be affected if you fail to do so. A notice of at least 2 weeks is usually acceptable but it may depend on the needs of the company. You may opt to stay longer if you can or if they need you until the post is filled in.
Failing to participate in the exit interview
Most companies conduct exit interviews so if your company practices this, too, your participation is highly encouraged. And as you participate in a formal exit interview, be sure to keep it as professional as possible. Provide appropriate and constructive criticisms. Look at this as an opportunity to impart things you think can help improve the company you’re leaving behind.
Bad-mouthing your boss and your company
It’s not uncommon to hear employees quitting their job because of bad bosses. However, even if you find yourself caught in the same dilemma, it is never appropriate to say that they’re incompetent.
In the same way, even if you weren’t happy with your company in any way, there’s no need to really talk about it. Remain professional and have the people in the management tackle problems of the organization.
Refusing to train your replacement
Making time to train the next person who will be taking your role can help your company with the transition. Not only is it a proof of your commitment to the company but i can also help you get a positive recommendation shall you need it in your future career opportunities.
Failing to take note of accomplishments and lessons learned
Whether you’re quitting your job for good or bad reasons, there will always be valuable lessons worth taking with you. Before moving on to a new career path, take time to jot down your achievements as well as the lessons you’ve learned from the experience. Don’t always put the blame on your boss or company for your being unhappy at work. Learn from your previous job and use the lessons learned to be a better employee in your next company.