I'll be starting my first job ever in a week or two and I've been reading on the proper way to write emails for instance how messages and subject lines should be short and to the point, never use acronyms, limited punctuation, etc. But I'm still not sure about the salutation part and how I should open and end an email. I've read that it's recommended not to write formally with for example "Dear" and "Sincerely". But instead it's better to be informal and casual because it sounds more friendly? And to stay away from old-fashioned closing statements such as "Best Regards". For example: Hi, *first name* and ending it with "Thanks" followed by the sender's first name only. I don't know, I've read that formal is good but I've also read how informal is better. How do you do it?