I don’t always get it that quickly but I do a mixture of:
Using words that are often in Wikipedia entries - century, war, time, first, last, known, earliest, latest etc, to get more of an idea of what kind of entry it is
Looking at any unusual syntax and the titles,which might give an idea of what kind of entry it is - a person, a thing, an event - or trying words like science, history, to narrow it down
Once I have that idea using words which are often used in that kind of entry - so if it is a person, married, son, daughter, he, she
I will often try countries - England, Spain, France seem popular
Then seeing if I can follow a theme, if anything jumps out at me - a country, a war, a time period.