Checklists
Having been the subject of attacks the DNC has produced a guide for activists and campaigners which makes a very useful checklist.
https://democrats.org/wp-content/uploads/Device-and-Account-Security-Checklist.pdf
The EFF's Surveillance Self Defence
https://ssd.eff.org/en/module-categories/basics
The ASD's guide
https://www.cyber.gov.au/acsc/view-all-content/advice/personal-security-guides
I don't necessarily agree with the prioritisations but this is a good list
Windows
SwiftOnSecurity's guide to decent security
Home Networks
Better secure your home router
https://www.routersecurity.org/
The NSA's guide to "Compromised Personal Network Indicators and Mitigations"
Apple iOS devices
Apple's guide to "Device and Data Access when Personal Safety is At Risk"
Checklist: If you want to make sure no one else can see your location
https://support.apple.com/en-us/HT212023
Checklist: If you want to stop sharing with someone whom you previously shared with
https://support.apple.com/en-us/HT212022
Checklist: If you want to see if anyone else has access to your device or accounts
Signal
Multi Factor Authentication
Types of Multi Factor Authentication ranked
https://danielmiessler.com/blog/casmm-consumer-authentication-security-maturity-model/
Privacy Tools
A pretty comprehensive list