There are many Open Street Map viewers, both web based (planning on laptop) and mobile (offline navigation in mountains) based. All are visualizing the same OSM data set in different ways, suitable for different purposes. Let's take a closer look at a very useful one - Waymarked Hiking Trails (WHT) - particularly suitable for planning hiking routes and longer traverses.

Where the standard OSM web site (osm.org) shows hiking trails only at high zoom level / low scale, WHT will present a comprehensive overview of available hiking trails in a given region at any scale. Let's take a look around Manali:

https://hiking.waymarkedtrails.org/#?map=11!32.2082!77.1993
(open on mobile or laptop)

One can zoom in / out to show more / less hiking routes: