As you will make your inventory of these 20-30 birds you will learn a lot about birding. Then wherever you travel- from Himalayas to the Sea, from desert to the forests, cities or villages, just get out of your hotel in early morning and take a small walk to look for local birds. There is always some nature walk-easy to moderate to difficult- near most of the places. Many places keep a check list/photo list of birds found in and around. For example, Anil Farm House in Gujarat had a Board pinned up at the reception showing the birds which prompted us to take morning and evening walks along the river to look out for birds, although it was not a birding trip. Similarly we spotted Eurasian jay while trekking at Chaukori, while Asian paradise Flycatcher was spotted while boating in Saattal. As you start birding your eyes and ears become adept at observing birds wherever you are. Then of course there are specific birding sites and sanctuaries where an organized birding trip can be very rewarding.