ReactJS component names must begin in uppercase: Knowing this can save you hours.

Always name your own components starting with an uppercase. The reason is whenever the transpiler encounters an element type that starts with a lowercase letter, it assumes it to be a built-in component like <div> or <span> and results in a string 'div' or 'span' directly passed to React.createElement. But types that start with a capital letter will be resolved by the framework to a …

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Use HTML for structuring, leave styling to CSS.

In your HTMLs, use tags <strong> and <em> instead of <bold> and <italic>. Browsers with correct capabilities, will deal with <strong> and <em> appropriately, which includes displaying bold and italicized texts too, but these browsers would use <bold> and <italic> tags for just styling the displayed text and leave it at that.

Stackoverflow’s Survey 2017

Result of "Most Loved, Dreaded, and Wanted Languages", show Python is the most wanted, but it's not the most loved. Interesting. While Django is 'conspicuous by its absence'.