Summarize this article in one sentence.
The educational and qualification requirements to become a corporate trainer are not completely clear-cut and there are a variety of ways into the field. In most cases you will be expected to have attained a bachelor's degree in a relevant subject. Trainers are generally Human Resources specialists, so many will have a degree in Human Resources or something similar, but many employers will not specify a single required major.  You should focus your education on the area in which you wish  to work. For example, if you want to be a corporate trainer in finance, having qualifications that prove your expertise is a good idea. If possible, try to include some education in human resources management in your studies. If some instances employers will look for a master's degree for higher level corporate trainers.  If in doubt, look up some job adverts in corporate training and look at the required qualifications. There are ways into a career as a corporate trainer that do not necessarily require you to study for a degree. For many employers first hand professional experience is just as important, if not more so, than qualifications. If you would prefer to be working right away consider trying to get work as a training assistant or human resources assistant. These positions are less likely to require a degree and will give you invaluable experience.  It is not uncommon for trainers to begin as assistants in human resources and develop skills on the job.  Working your way up will help you understand corporate processes and policies before taking on the role of instructing and supervising others. Communication is the central element to successful corporate training so it's crucial that you really target this as an area to improve before you try to enter the job market. Trainers will spend a lot of time talking to large groups and need to be engaging and clear in how they do this. There are a number of ways for you to work on this, and you should look for opportunities to develop all the time.  Try taking a public speaking course or joining a group that specialises in practising and improving public speaking.  Search your local colleges and training centres for courses on public speaking, communications, and other speaking and presentation related skills. An alternative career path for corporate trainers involves transitioning from teaching to training. Teachers have excellent experience of imparting information clearly and concisely to large groups and these transferable skills can be very valuable for a career as a corporate trainer. It is not always easy to make the transition, but having specific skills and knowledge of the business area you wish to work in will make a big difference.  Teachers used to a classroom full of teenagers may find the idea of training motivated adults appealing. The more mature audiences in corporate training will bring in their own experiences and expectations which can be challenging for someone used to teaching children.

Summary:
Take a relevant bachelor's degree. Learn on the job. Improve your communication skills. Move into training from teaching.