Making changes without breaking anything.
WHAT YOU CAN SAFELY CHANGE
Text on pages Images Prices Opening hours Adding new pages and posts
WHAT TO BE CAREFUL WITH
Deleting pages, which breaks links pointing at them Changing page addresses, which breaks links and loses search ranking Anything in settings you do not understand Installing plugins
BEFORE A SIGNIFICANT CHANGE
Take a backup. It takes two minutes.
GOOD HABITS
Preview before publishing Paste text as plain text, so formatting stays consistent Resize images before uploading Check the page on a phone after editing
IF YOU DELETE A PAGE
Set up a redirect to the closest relevant page, so anyone following an old link still arrives somewhere useful.
IF YOU CHANGE A PAGE ADDRESS
Redirect the old one. Otherwise every link and search result pointing at it breaks.
WHEN TO ASK FOR HELP
Anything touching settings, plugins, or the theme. Content changes are safe; structural changes are where sites break.