The first is the observation tools needed for bird watching. 
A professional spotting scope, binoculars, phone mounts, tripods, and cameras.
Binoculars are generally fixed magnification and be used to observe moving birds or to lock onto a target first. Next, a spotting scope must be the first choice if you want to see the detail of these cute creatures, like the vibration of the bird's feather.  Of course, it's not far enough to see cute birds with naked eyes, they also deserve to record. If you want to simply record the birds, a stable phone adapter is enough. Also, you can also connect a camera to get high-definition photos, such as a Canon camera.
I'd like to recommend a set of gear for birding: SV406P+ SC001 wifi camera. No matter whether you are a beginner at birding or not, this set of gear is enough. 

A bird-watching book is one of the essential items for bird watchers. A good bird watch book can help you quickly determine the species of birds and make it more convenient to record. But there are many kinds of bird watching books, finding the one that suits us. In the selection, you need to determine the ​​bird-watching books according to your area.

Clothing
A pair of well-fitting sneakers should be as soft as possible, so that they will not make too much noise when approaching birds, making them easy to approach. 
Don't wear clothes that are too brightly colored or have odd patterns that are too easy for birds to spot or startle them to fly away quickly.

There are frequent bird activities in summer, so pay attention to sun protection! A combination of sunscreen + fisherman hat + sunscreen sleeves can be used. Ultraviolet rays can cause great damage to the skin, but this is the time when birds are most active. It is very important to take sun protection measures. Be careful not to get sunburned. 
In summer, you can carry some anti-mosquito medicines, or wear long-sleeved trousers directly, which can minimize the probability of being bitten by mosquitoes. After all, they are often observed in the woods.