Parameters are the solution to several of the handiest tricks in Tableau because of their flexibility. Other than filters, parameters are also one of the most powerful tactics in Tableau for transferring control from the author to the end user.
Slope graphs, or essentially line graphs between two points, are one of my favorite Tableau charts when my analysis requires a comparison between two data points. They work so well, in fact, that they are the one chart I will use to connect lines between discrete categorical variables. In almost every scenario, lines should only be used to connect points in time, but with slope graphs, I am okay drawing a line between ‘Thing 1’ and ‘Thing 2’, as well as ‘Time 1’ and ‘Time 2’.