Here is some more explanation of the hiking trails:
There is more explanation at the bottom of this list:
www.jungfrau.ch/en/som mer/tourism/destinatio ns/kleine-scheidegg/hiking-trails/
Kim has some more notes on page 5 of her omnibus guide to the region:
Most guides say you can walk the yellow trails in "ordinary " shoes or sneakers. They'd better be waterproof.
The "mountain trails" (red) expect boots or hiking shoes with heavy lugged soles and at least one hiking staff. In German "ein Spazierstock."
All that may be true, but I've been hiking around Switzerland for about 30 years and am now in my 70's.. I am not a long distance hiker. I do day hikes. I would not think of getting on the trail without hiking boots and a hiking staff.
Why? Ankle support. It is easy to slip on the gravel on the best of trails, and if you turn your ankle, you will not hike for a while.
Lugged soles are recommended because you have better grip on uneven surfaces, and they are thick enough to absorb minor irregularities.
A hiking staff provides invaluable support on downhill stretches with gravel or slippery surfaces. I put mine out ahead and brace against it.
My own boots are Lowa Renegade II's. Selected for relatively light weight, Vibram soles, a good brand name, and availability in large sizes. (Big feet.) Plenty of other good brands exist. Thos boots are not rugged enough for extensive hiking on trails with lots od scree; they can abrade and have sewing on the exterior surface.
The following link provides the best topo map of Switzerland. It has a large variety of overlays, tremendous detail, and good altitude data.
In this link I have turned on an overlay ("additional maps" for hiking trails. (Also, public transport stops.) They are color coded to match the yellow, red, and blue (technical climbing) trail makings:
map.geo.admin.ch/?topic=ech&lang=en&bgLa yer=ch.swisstopo.pixel karte-farbe&layers=ch.bav.ha ltestellen-oev,ch.swisstopo.swiss tlm3d-wanderwege&X=161530.00 &Y=637120.00&zoom=6
This map is more easily used, but I have not figured out how to turn on altitudes. Gotta have altitudes.
Under "Points of Interest" you can turn on lots of different kinds of information, including hotels and restaurants ( under Gastronomy.)