It is Possible to Upgrade the RAM and Storage of Your M1 Mac After Purchase
Upgrading RAM in Your MacBook Pro 13" or 15" : 19 Steps (with Pictures) - Instructables
How to upgrade the RAM on your 13-inch MacBook Pro
A-Tech 16GB (2x8GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
MacBook Pro 17" Unibody RAM Replacement - iFixit Repair Guide
How To Upgrade RAM On MacBook Air?
How to Upgrade RAM on MacBook Pro, iMac & More | AVG
M1 Mac RAM and Storage Can Be Upgraded after Purchase
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
MacBook Pro: How to remove or install memory - Apple Support
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
Memory RAM Upgrades for MacBook Pro (2012 - Late 2016)
M1 Mac RAM and SSD Upgrades Found to Be Possible After Purchase - MacRumors
Apple Doubles the Price of RAM Upgrade on Entry-Level 13-Inch MacBook Pro - MacRumors
MacBook Ram Upgrade Seattle
M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac