A trial usually means the team is assessing fit
In grassroots football, a trial may simply mean a coach wants to see whether a player suits the team, age group and level. It should not be treated as a promise of selection.
A training session may be more informal
Open training can be a way to meet the team, understand the coaching style and see whether the player feels comfortable. Ask whether the team is actively taking players before attending.
Parents should check the basics for children
For children, parents should confirm the age group, venue, coach, welfare contact, cost, equipment and whether parents can stay. Avoid sessions that rely on vague promises or pressure.