latitude,longitude

yesterday me and my class were learning about longitude and latitude.we had to mark a place to go 

we had to mark a point. after we marked a location we had to go to that mark. after were done our buddy had to come out to see that if we were in the right spot.i got two wrong.so what you want to go on is https://getlatlong.net/ this link. after you are to mark a point u have to click ctrl then you click the pad thingy on your Chromebook when u finish marking Ur point it will look like this

 have you ever heard of point mark