Many blog posts for you

SQL snippet for creating a database with a login and user in SQL

How to create a vCard in .NET

How to serve content for legacy .html urls in an Umbraco 8 site

How to create a custom section and dashboard in Umbraco 8

How to send emails in Umbraco 9 using IEmailSender

How to create a NuGet package for a simple App_Plugin style Umbraco v9 package

Umbraco 9 Useful Snippets

100 Days Of Umbraco Day 1

How to do CRUD operations with NPoco in Umbraco 8

Regex to check if there are at least x number of digits in a phone number string