The four letter word for experts is "Guru". A guru is someone who has a great amount of knowledge, skill, and experience in a particular field and is able to guide and advise others who are less experienced. They often have significant influence within their respective fields, and are looked to as an authority on certain topics.
For example, if you are trying to learn about a new programming language, you might look for a guru in that area that you can talk to and get advice from. Or if you have a specific business question, you may seek out a guru in business or finance to answer your questions.
Gurus often get to this level of expertise through a combination of rigorous training, years of experience, and the confidence that they have in their abilities. They share a passion for their field, and strive to further their knowledge and help others grow their understanding as well.
If you are looking to learn more about a particular topic, finding and connecting with a guru in that area may be a great way to fast-track your progress and enhance your knowledge.