I made a 'sampler' book of my (style) code experiments (mostly chapter headings and first paragraphs)
This is also a great way to learn HTML/CSS
Also, remember to always VIEW your masterpieces
on target devices (don't just trust emulators; if it looks GOOD. OTOH if it looks BAD, it ain't gonna get better

)
Many of the PC 'Viewers' support features that are NOT available on devices. They also have access to SYSTEM fonts that are not on devices.
Devices also have their own ways of doing things ('we know best'

)
and the have screens that run from tiny to wall size. Monochrome to a bazillion colors.