Alerts and web-browser tools can help you book a Covid-19 vaccine appointment. WSJ’s Joanna Stern met up with Kris Slevens, an IT guy who has booked over 300 appointments for New Jersey seniors, to learn the best tricks to compete in the vaccine-booking Hunger Games. Photo illustration: Emil Lendof for The Wall Street Journal More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #WSJ #Vaccine #HowTo