Slight Knee Pain – What exercises to use?

I have slight pain in my left knee during heavy physical use.
If I don’t sleep or eat, and just stand all day, it’ll hurt a bit too.
I was given a knee brace and arches for my shoes from the local orthopedic institute, and those help immensely.
I had physical therapy scheduled to learn new exercises but due to an insurance mishap I can’t go.
I was wondering what types of exercises I could use for this problem.
I found this websitesensored://orthoinfo.aaos.org/booklet/view_exercise.cfm?Thread_ID=15&topcategory=KneeIt seems good, but you never know. Any recommendations?Appreciate the help!!