Got your first DSLR (i.e. Nikon D3400)? Consider Back Button Focus (BBF)!
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As mentioned in previous videos, I really enjoy using Back Button Focus (BBF) and suspect you will do the same:). I find Back Button Focus more difficult to explain/convey than it is to simply use it.
Once you make the switch, give the new settings time to gel. After using the new method to lock focus, I suspect you will not want to go back. In addition, I suspect you will spread the word to other photographers and find yourself struggle to truly convey the benefits:).
Post any questions/comments below, and I will do my best to help!:)