Software and technology changes rapidly. I have noted below what I hope will still be useful in years to come.

Writing Clean Code #

Very generally,

• use the package manager
• use dependency injection
• create systems/services/components along meaningful boundaries. Test them
• assemble them until you have your application
• use CI/CD

Personal Security #

• Use a password manager. Don’t let breaches expose your password to other accounts.
• Use 2FA where important

TLS Security #

https://ssl-config.mozilla.org/

IOT #

Not sure if you can trust an IOT device? Use pfSense to create a segregated subnet for such devices. No consumer router can do this.