Here’re some products I recommend, largely based on my personal experiences or on reviews I trust:
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# Apple iPad Accessories
– Apple Pencil (2nd gen.) (For iPad Pro 2018)
– Apple Pencil (1st gen.) (For other supported iPads)
– Kanex Foldable Mini Keyboard
– Apple Smart Keyboard Folio (for iPad Pro 11″)
– Brydge Pro 11.0 Keyboard (for iPad Pro)
– Pipetto Origami Pencil iPad Case Pro 11″
– Paperlike iPad Pro 11 Screen Protector
# Apple Devices:
– Apple iPad Air (2018)
– Apple Watch (5th gen.)
# Non-Apple devices:
Mobile Computer Blog 