Favorite Search Engine 

Google.com

Repair Guide for Laptops/Tablets/Mobile Devices

iFixit.com

Youtube.com

RAM Configuration Tool

Crutial.com 

Disk Clone & Data Migration

Lazesoft.com

Diskgenius.com

Bootable USB Drive Creation/Customization

Microsoft Media Creation Tool (microsoft.com/software-download

Rufus (rufus.ie)

BolenaEtcher (https://etcher.balena.io)

System Utilities

Disk Cleanup (included in Windows OS)

CCleaner (ccleaner.com)

Malwarebytes and ADWcleaner (malwarebytes.com)

Documentation/Reference

visit support of specific product on the manufacturer's web site (Dell, HP,  etc.)

Tools Used for Repair

Laptops: precision tools (flat and phillip screw drivers)

Desktops: screw drivers (flat and phillip)

Mobile devices: pecision screw driver, or special tools come with the parts (Android or Apple parts)

Network tools: cable tester, punch down tools, crimp tools, wire cutter/stripper, etc.