Another newb question. I've always used Jira Software through work, never purchased it myself. So now I see there is a free plan available. Is this good enough to use as a practice space when working towards ACP-620?
ACP-620 pack includes a training course + a lab workbook + an access to an Atlassian lab. That was enough for me to clear the exam.
Investing time to play with Jira Cloud (free plan) and get more experience, is certainly a plus. Enjoy your learning :-)