Smart Search Field in Safari (macOS)
Press Command + L to put the cursor in the Smart Search field and select what is in it.
What it does
Safari calls its address bar the Smart Search field, because it takes both web addresses and search words. With the content selected, what you type replaces it. Under the field Safari suggests pages from your bookmarks and history, open tabs and searches. Escape puts the address of the page back into the field.
More Safari shortcuts: General
All 58 Safari shortcuts for macOSThe full list has a search and a printable PDF.
Questions
What is the Safari shortcut for Smart Search Field on macOS?
⌘L (Command + L). Press it to put the cursor in the Smart Search field and select what is in it.