Disclaimer: I am not an expert on this nor do I have personal experience with it. This research is not extensive. If writing an amputee character, I suggest you do more research than what I have here. Always focus on personal experience from actual amputees. I would advise you to look out for ‘inspiration porn’ written by non-amputees.
General
10 Things Amputees and People With Limb Differences Want You to Know
Your Stories
Amputee Stories Archive
Arm Dynamics Feature Patients
Amputee Life Hacks (videos)
OPC - Orthotic Prosthetic Center
Wiggle Your Toes: Personal Experiences
Personal Stories
Real Stories
9 Things I Wish I Knew When I Became an Amputee
TW: mentions of people fetishizing amputees
The Active Amputee Podcast on Spotify
Resources for Amputees
Bilateral amputee finds acceptance a magic path to recovery
Writing Amputees
Note: this is from someone married to an amputee
Things Not To Say To Amputees (video)
TW: mentions of fetishising amputees
Things I'm Tired of Hearing as an Amputee (video)
TW: mentions of hate comments, fetishising amputees
25 Things I Can Still Do as a Quadruple Amputee (video)
Congenital Amputees
Congenital Amputation
Congenital Limb Defects
My Life as a Triple Congenital Amputee…And What You Can Learn From My Story
Stump Kitchen: Born an Amputee (Amniotic Band Syndrome)
Note: Also check out the Youtube channel she mentions
What's Wrong with You?
Arm Amputees
The First 12 Months After Upper-Limb Amputation
My New Life with One Arm
TW: mentions of having sex (very brief - one or two sentences)
Surviving the terrifying loneliness of being a young person with an amputation
TW: mentions of people saying they prefer death over amputation, using racist, sexist, and homophobic comments (no actual comments are used), declining mental health, dismissal of mental health issues, and body image issues
The Complete Guide To Arm & Hand Amputations and Prosthetics
Miles O’Brien shows us how he adapts to living without his left arm
Linda's One Arm Web Site
Amputees Top 5 Things I Do Differently With One Hand
Leg Amputees
Their Stories
Amputee Girl on Fire
In a City That Walks, Choosing Amputation for a More Active Life
A Day in the Life of an Amputee
Phantom Limb Sensation (PLS) and Phantom Limb Pain (PLP)
Phantom Pain
Managing Phantom Pain
From Mainstream to Unique: Ten Techniques to Treat Phantom Limb Pain
Can virtual reality games help with phantom limb pain?
AmputeeOT: Discussing phantom limb sensations and pain with amputation
Phantom Sensations (video)
Prosthetics and Other Products
Real Life Prosthetics
Arm Dynamics
Amputee Store
21 Things These Amputees Can't Live Without
Why I Don't Wear Prosthetics (video)
Why I Want a Prosthetic Leg ($20,000+) When an iWalk ($150) "Works"?? (video)