How to use Exif Tool to change the date taken and date created of multiple JPG files in a folder to a desired initial state and then increment the time for each file by 10 or 30 seconds?
Use the command in FAQ #3 (https://exiftool.org/faq.html#Q3) to figure out what are the names of the tags you want to change. If you're on Windows, see the Windows Metadata post (https://exiftool.org/forum/index.php?topic=6591.msg32875#msg32875) for a list of what tags Windows reads to fill the Properties window.
Then you can run the command in this post (https://exiftool.org/forum/index.php?msg=82058). The example of AllDates will write the CreateDate, DateTimeOriginal, and ModifyDate tags, but if these aren't the tags you want to write to, then replace AllDates with the name of that tag.
If the filename includes the date/time of the file, you might want to copy that time stamp directly from the filename. See FAQ #5 (https://exiftool.org/faq.html#Q5).
If you're on Windows, use CMD, not PowerShell. If you're on Mac/Linux, swap any single/double quotes.