DirectX 12 is an expert API it is usually recommended to start with 11. You can achieve the same things with both, 12 offers just more control and possibly more performance provided you know how to use it properly. rastertek.com/choosing.html
In addition there are tons of projects still using DirectX 11, it's not because the number is big that it means lower versions are useless or irrelevant.
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DirectX 12 is an expert API it is usually recommended to start with 11. You can achieve the same things with both, 12 offers just more control and possibly more performance provided you know how to use it properly.
rastertek.com/choosing.html
In addition there are tons of projects still using DirectX 11, it's not because the number is big that it means lower versions are useless or irrelevant.