Read up on, and observe, different flight patterns, birds fly in many different ways, watch them sometime you will be amazed. Watching birds fly is often an inspiring experience. Some birds make song flights always in a specific form, hovering or descending in a particular way. Other birds sing from definite parts of a tree, some from the top some from lower down, some form within the shrubbery. Remember birds migrate so sometime they are only in your area for a few months of the year.
Birds are often far away, relative to our eyesight.
For this reason binoculars and birdwatching telescopes are readily available. Sometimes the choice is bewildering and the advice confusing. The simplest advice I can give is to say work out your budget and then try out what is available. Do not be in a hurry, give yourself time to shop around. Remember, for most people this is a reasonably expensive outlay, especially telescopes, and you will be stuck with what you buy for many years.