I just use Bootstrap and don’t worry about learning CSS. Probably because I suck as CSS.
But if I can use a few Bootstrap classes to make my app ‘presentable’ and ‘professional-looking’ and spend my time on what’s important…functionality and security…then I’m happy to.
Sunscreen. This is not limited to occasional outdoor activities, because the bulk of your UV exposure over a lifetime is your everyday exposure. Use an everyday SPF moisturizer on your face, neck, and arms.