Advance registration is required for this free workshop at the Hollywood Senior Center, 1820 NE 40th Ave. The Portland Youth Builders will lead a 30-minute presentation, followed by 20 minutes of hands-on activities. The high school students will have laptops on hand and encourage class participants to bring their devices and questions. Space is limited, so if you are interested, call the Hollywood Senior Center at 503-288-8303 right away to register.