The Geometry Nodes team has been doing an incredible job week in, week out when it comes to this module's development, adding in new nodes and developing the system at a bewildering pace.
While Jacques Luckes has been hard at work developing prototypes for the new attribute proposals, Blender developer Hans Goudey and frequent contributor Johnny Matthews have been doing a stellar job shoring up the available nodes in GN, with the latest area of focus being curves.

The New "Set Spline Type "node gives the ability to manipulate curve types within a Geometry Nodes tree
This week, two new curve editing nodes have been added: the Select by Handle Type node and the Curve Set Spline Type node. While their names are pretty self-explanatory, Johnny Matthew's video on his youtube channel does a great job of showing them in action.
Check out Johnny's channel for more explainer videos on Geometry Nodes and more on the link below: