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I would like to learn the subject 'complex numbers'. My goal is to study this on my own. Are there any good tips, books, sites to study this?

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    $\begingroup$ This will depend on your starting point. If you have already studied calculus, then the Schaum's Outline volume on Complex Analysis is good for self-study. $\endgroup$ – Gerald Edgar Apr 12 '17 at 14:32
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    $\begingroup$ I would avoid Schaum's Outline's; they're close to useless. $\endgroup$ – Daniel R. Collins Apr 12 '17 at 15:31
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    $\begingroup$ Complex numbers as in arithmetic with and properties of numbers of the form $a+bi$ or as in the more advanced complex analysis? $\endgroup$ – user6648 Apr 12 '17 at 16:41
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    $\begingroup$ Would this be more on topic on math.SE? $\endgroup$ – Ben Crowell Apr 12 '17 at 17:54
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    $\begingroup$ I voted to close based on the comment of @tilper: I do not know whether this question is at the Algebra 2 level, or post-secondary Complex Analysis, or ...? $\endgroup$ – Benjamin Dickman Apr 12 '17 at 22:36
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May I recommend what I did in the MESE question "Complex analysis (Applied versus pure) (and in this earlier MSE question, "Visual research problems in geometry):

           Needham cover

      Figure 13

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I suspect that the question may be starting from the point of "what are complex numbers" (far below the level of complex analysis). For that purpose, Wikipedia: Complex Number is a perfectly acceptable article with plenty of information.

If you're more of a video-type person then Khan Academy: Intro to Complex Numbers might be satisfying for your purposes.

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