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Personally, I immediately don’t trust this book because the example on the page of the list UI puts a big red X over the version I prefer and find easier to read.

Half agree. The left version I feel has too many sharp lines and bold distinguishing features, so you don't know where to look, where the version on the right has too few so you don't know where to look.

I know exactly where to look, the little squiggly lines called letters and numbers, nicely separated from other rows with actual visible separators, instead of just floating out in the same ocean of grey.

Doing more certainly help, especially doing it more but deliberately. Trying new ways, getting feedback and repeat.

Yet another $149 course. The best online resources are free.