How big is the boat you want to anchor? small boats 12, 14 ft etc many use mushroom anchors, however, they don't hold on rocky bottoms so a danforth or grapple or similar should be used, for larger boats a danforth or plow. No matter which anchor you use you should use a chain between the anchor and the rode (rope) and you should have more rode than you think you will need, 7 times the water depth, 10 times in bad weather.
If it's on an inland lake go to the local garage and get yourself a bad rotor from a car or a truck for a bigger boat, usually free for the taking. Add a bolt, chain, and nut. Strip the treads on the bolt and you have an anchor that will hold in but the really really worst weather. The one I'm using is going on 10 years.
If I'm fishing next to a jetty for weakies, stripers or tog I have a couple anchors I made out of rebar, so if it gets hung up I just get as much line back as possible then snip....snip your on the way.
My main anchor is a 13 lb danforth with a 6' piece of 7/16" chain and 300' of 1/2 nylon line. I also keep another length I can shackle to the main line if I need more scope or lose the main anchor.
Unless you have a small boat I would stay away from the Polypropylene ropes, it floats, is not good when constantly exposed to the sun and will give you a nasty burn if it slips through your hands.