Wikihow pages on straps, compression shorts and tights
 

The jock strap page on how to wear a strap is interesting and has some neat drawings

https://www.wikihow.com/Wear-a-Jockstrap

here is the one on choosing and wearing compression shorts

https://www.wikihow.com/Wear-Compression-Shorts


And a similar one on the wonders of running tights

https://www.wikihow.com/Wear-Men%27s-Running-Tights

Are these pieces aimed at 12 year olds and those with limited reading skills ?

Some of the pages cover topics probably not exactly suitable for 12-year olds such as this one. Others seem directed toward an anxious teenager contemplating his first strap or speedo. I too wondered who the target audience was.

https://www.wikihow.com/Locate-Your-Prostate

Wikihow even shows how to tuck for swimming, I recommend method 2, a Gaff thong, I wear one at a crowded beach.
https://www.wikihow.com/Tuck-for-Swimming#Gaff