Always prefer clear and concise labels to facilitate reading and invite the user to scroll through the content.
Try to make the title as short as possible. It will bring clarity and more straightforward information.
Always use a "+" icon to expand and an "-" icon to close.
Do not use another icon to expand or close accordions.
Use a "Collapse all" and an "Unfold all" when grouping several accordions together. This allows the user to easily arrange the content visible on the screen.
Don’t make it hard for the user to arrange the content visible on the screen.