PostEaseAccess to content is not the same as the right to post it
Being able to save an image, download a song, or screenshot a video does not grant the legal right to post it. Copyright generally belongs to whoever created the work, regardless of how simple it is to copy. This applies to music, images, and video clips found anywhere online, not only to obviously professional content.
Music is one of the most common, avoidable mistakes
Using a popular song's full, unlicensed recording as background audio is one of the most common copyright issues on social media. Most platforms' own built-in, licensed sound libraries exist as a legal way to use trending audio without that risk, and are worth using instead of an outside audio file.
Reposting someone else's content requires real permission, not just credit
Tagging or crediting the original creator is a courtesy, not a legal substitute for permission. Reposting someone else's photo or video without asking first can still be a copyright issue even with credit given. Ask directly, and keep a record of the response.
This is general awareness, not legal advice
Copyright law varies by jurisdiction and specific situation. For anything with real business or legal stakes, check with a legal professional rather than relying on general guidance like this.