Bro, Himachal offers a variety of treks and the best usually differs from person to person. It varies in difficulty, budget, route, and many other aspects. So, instead of asking for the best trek, just check out the link below and select the one for yourself
https://www.tripoto.com/trip/7-treks-for-the-first-time-trekkers-5ba79286d352d
You can go to Prashar lake trek,Triiund trek and Kheergnaga trek..All are one day trek..You can check itinerary or pictures of trek on my post on tripoto.
Rasol
it starts from chalal village which is near kasol. a walking distance beside the parvati river is made towards chalal through which you can start your adventurous trek towards Magic Rasol
Hi, Himachal is a paradise for trek lovers and there a few treks which can be done during wintertime to experience snow. The best ones are Parashar lake trek and Triund Trek. Although the level become difficult in snow. Here is a list of winter treks you must take https://www.tripoto.com/trip/top-5-treks-you-should-take-this-winter-58410aad0212c
Triund trek- It starts from Mcleodganj
Parashar lake trek- It starts from Mandi
Bhrigu lake trek- The base point is Manali. All this are moderate short treks of 8-10 km. I have been to Bhrigu lake in 2014 and Triund recently. For places of stay and expense, you can visit my profile.
Himanchal is full of treks .In Manali region you can try Rasol
Malana Kheerganga All three are near Kasol.
Rasol- For rasol trek you can start in morning as it will take more than 3 hours to complete.Reach there and enjoy their speciality.We spent whole night in rasol and it was memorable. For Malana you can visit my published trip https://www.tripoto.com/trip/amazing-trip-5bc25b7ec6343#.W8T0J6e9gIQ.whatsapp