Do not use slashes. They're often unclear and ambiguous.
Screen readers read web text out loud for people who are visually impaired. It can be confusing when they say the word "slash".
Instead of writing "and/or" choose whether "and" or "or" is accurate and use that. Sometimes you may mean both. If so, write "both" or "either".
But: and, or, both, either
But: 24 hours a day, seven days a week
Use a hyphen to connect equal terms or words rather than a slash.
Do not use slashes in dates or years.