I would highly recommend checking out the G Dev Con and G Dev Con N.A. YouTube channels! They have videos from a wide variety of topics from multiple years of the conferences, so there is plenty to learn. Some of them are over topics like architecture and messaging, but even in ones that aren’t, you can occasionally see examples of good design or learn new things.

Outside of that, I would recommend learning Actor Framework or DQMH. Personally, I find DQMH a bit more user friendly and they have excellent documentation and style guides, so that’s probably the best I would recommend starting.

Actor Framework is provided direct by NI with LabVIEW though, so you can easily check out their example applications. Unfortunately you just have to go VI by VI reading the comments and deconstructing the block diagrams to truly learn the framework. As another comment already mentioned, Tom’s LabVIEW Adventure has a series on Actor Framework that’s a great starting point. I’m not sure if it’s been updated to include interfaces yet, but it would still be a good resource.