Learn English – How to explain the word “shadow “as a noun

"Fit" is an adjective meaning acceptable, proper, or appropriate.

You might say, "After the repairs, the car was again FIT for use on the highway." It is fairly common to say that something is "fit and proper", either in general or for a particular purpose, like, "Bob is a fit and proper gentleman", or "It is fit and proper to kiss on the third date", though this is a somewhat anachronistic usage. And you can say "he saw fit to do this", meaning, "he thought it was appropriate to do this".

Just to be clear: In general, you do not use an article with a proper name in English.

Where you do put "a" before a proper name is when you want to indicate that all you know about the person is his name. If someone you know who is named Bob Smith is selected for the job, then you say, "Bob Smith has been selected." If you read the name in some sort of announcement and have no idea who this person is, then you might say, "Someone named Bob Smith has been selected", or "A Bob Smith has been selected." Often in that case you put the name in quotes. This would also apply if there are several people with the same name and you are not sure which it is. "Who was selected?" "A Bob Smith. But I'm not sure if it's the Bob Smith from the English Department or the Bob Smith from the Math Department."

You almost never use "the" in front of a person's name. If you do it's usually when you are specifying just which of several people with similar names you mean. Like in my example above about the two Bob Smiths. Or if you want to make clear that you mean the famous person by this name. Like, "We got THE Bill Gates to speak at our conference", meaning, the actual famous person of that name, not just someone else with a similar name.