Windows: use the Character Map, Alt codes, or switch to a multilingual keyboard layout
Mac: hold down a letter to see accent options, or use the Option key shortcuts
iPhone/iPad: press and hold a letter to choose an accented version
Android: press and hold a letter to select an accented character
Google Docs/Word: use Insert > Special characters or built-in accent shortcuts
Copy and paste accented letters from a character table or online keyboard
Use a Unicode input method or international keyboard layout for frequent accent typing