Folks are rightly mentioning PWA and building react apps that render on mobile and tablet and desktop. Give that a go. If you look at react native then they go native. The really good sample apps have to recode between ios and android; yet they can go deeper in each. Fiddling around with why a line is duplicated in android but not ios is okay to solve if you are being paid to solve it. If you are tying to learn to build general things then starting with react at PWA is going to cover more ground.
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Folks are rightly mentioning PWA and building react apps that render on mobile and tablet and desktop. Give that a go. If you look at react native then they go native. The really good sample apps have to recode between ios and android; yet they can go deeper in each. Fiddling around with why a line is duplicated in android but not ios is okay to solve if you are being paid to solve it. If you are tying to learn to build general things then starting with react at PWA is going to cover more ground.