haha where did you dig that up 😛
Anyway. that's it basically what a TMA (Terminal Maneuvering Area) is. That's what a STAR is and you select it based on how you approach the terminal area.
If you're approaching Athens (LGAV) let's say (an airport I know well, hence the example): Athens has many entry points (NEVRA, ABLON from the north PIKAD, NEMES, ASTOV from the west VELOP, BADEL from the south and VARIX, KEPIR from the east). Your flight plan will take you (stop at) one of those points. That point is the name of the STAR you're going to use.
The STAR also has a suffix, depending on which runway you're approaching. So for example the STAR is PIKA1C if you're approaching runways 03 L/R but PIKA1A if you're approaching 21 R/L.
You STILL enter the TMA from PIKAD, but the route INSIDE the TMA is a little different. How you choose the runway? Look at the weather (or if there is ATC online, check the ATIS). If the wind is runway heading +/- 70 degrees, that's your runway. For example, runway 03 (L or R - for Athens L is the runway for arrivals usually) is good for winds from 320 to 100. Runways 21 (L or R - obviously 21R is the usual arrival) is good for wind 140 to 280.
This still leaves two pieces of the pie (100 to 140 and 280 to 320). What happens there? CROSSWIND LANDING BABY! Yep, your skills are put to the test 
Hope this helped more than confused - if you need more, let me know.