Go ahead, tell him you are searching for a job. As much I would like to say is, if there's room for job employment then u should take the chance b4 the opportunity slip off, which u might not know. So, My advice take the chance and go tell ur boss, don't wait. An opportunity comes but once.

Unless you are fishing for a better position at your current company, just give two weeks notice when you get hired by another place. My experience is that when someone leaves, there's not much effort to replace them or train their replacement until the last minute anyway. When I retired I gave my boss 3 months notice. I trained my replacement on my last day of work. My replacement was a part timer working in our department who was offered a full time position to replace me.

I would never tell my boss I'm looking for another job. Or that I'm unhappy there. (Whether I knew him or her from another job or not.) Why would they invest anymore time in you as a worker if they know you want to leave?

Telling your current employer about your job search is suicide.

Please don't, it's super dangerous.

The minute you tell your boss that you're job searching, this is what will happen: * Your boss will immediately start looking for your replacement and may find one, long before you are ready to leave. * You have proven yourself unreliable in your boss's eyes. * You risk being terminated on the spot. Never tell your boss you're looking for a job. Do a stealth job search. This means don't tell your boss and tell recruiters not to contact your current employer. While you are working, you have an advantage in the job market, as a "Passive Candidate". Employers discriminate against people who are out of work. And if you quit or are fired, you are seen as less desirable than those who are laid off.

Give them a notice according to the requested timeframe stated on your contract/offer letter.

Yes, be VERY careful as to what you fill out. When I have been offered a job or in the process of interviewing, I tell them straight out NOT to contact my current company. I don't know why this is not known by everyone who is working? Even on applications where it asks if they can contact my current employer, I check the "NO" box. There is no reason for them to contact your current employer if there are other jobs on your application that they can verify. I have several references from previous companies that they can call if need be. Never ever let on that you aren't happy at your current job or that you are looking for something else. What I have always done is make interviews as late as possible in the afternoon so that I'm at work for most of the day and ask to leave early for a "doctor" or "dentist" appointment. Then, go on the interview. The good thing is that many companies do initial phone interviews first. With the pandemic, even after it's over, I see more companies doing video interviews and then, having you come in person if you are one of the final candidates. That will be idea so that we don't have to take time off of work to interview unless we know we are one of the top selections.