First of all I wanted to thank you for this really helpful website and resource pack!
As a practice example I used Ex#2 of Basic concepts for ANOVA to perform, Shapiro-Wilk-Test, Levene-Test, and ANOVA. When I do the Shapiro-Wilk-Test on each of the groups I find that groups/methods 2-4 follow a normal distribution but group/method 1 does not. I thought in the case of a non-normal distribution I wasn’t allowed to perform ANOVA. I’m not very advanced in statistics, so I would really appreciate your help.