I strongly recommend Rick Steve's Jewish Quarter Walking Tour in Prague. I went on it as part of my 2022 visit.
In the Prague section of his Eastern Europe guidebook, Rick features some 20 or so sites in the old Jewish Quarter -- ancient synagogues, museums, cemeteries and other sites -- in an easy-to-follow map. Then he gives relatively detailed description of each site, why it's important, timelines and so on. For me, this is one of the most powerful collections of Jewish sights in Europe. The Old New Synagogue -- it's a confusing name -- from the 13th century is the oldest in Central Europe. The serene Old Cemetery is incredibly moving with its limited place and tens of thousands of graves; the tombs are piled atop in each other in many layers. The Spanish Synagogue might be the most beautiful temple on the planet. Rick explains why a synagogue in Prague is named Spanish. The Pinkas Synagogue has a moving memorial to the victims of the Holocaust. When I was there, I bought a book on the Golem, the mythological being from Czech Jewish folklore. I'm glad I read it. (Postscript: Rick probably features the Jewish quarter walk in his slimmer guidebook on just Prague.)
In Krakow, I strongly recommend a visit to Oskar Schindler's factory. If you visit it, you will see his office. Ghetto Heroes Square -- the place that the Nazis used as a staging point before they sent their victims to concentration camps -- is nearby. Kazimierz, the former Jewish neighborhood, is excellent. I thoroughly enjoyed my dinner at a kosher restaurant. The site of the Plaszow Concentration Camp in Krakow can be visited. Suffice it to say, Auschwitz is quite sobering. I have visited it twice and would go back again. You can book a tour at easily identifiable tour companies in central Krakow.