Welcome! ALL of the courses are carefully described… Simply enter the name of the route into your 'net search engine. You will find ample tactical (3D) displays and helpful strategic hints in the associated articles. Here’s an example:
Edit/supplement: As to the Ride-ons… this is already available. At least on my laptop. If you select a nearby rider in the ride list at right, a “thumb” appears adjacent to the name. Select the thumb: Ride On given!
Though the OP mentions “so you can prepare yourself e.g. for climbing, downhill etc” so I suspect he wants the mini-map to provide better insight into the pain coming up as well, which the overlap of zwifthacks doesnt provide.
A vote for either of these is probably worthwhile: