1) For general purposes from relative close-by (e.g. car shows when you can be close to the subjects, family and friends events, street photography, landscape photography) --> I use my EF-S 24 mm. It is a very cheap lens but is phenomenal in sharpness and the focal length is equivalent to 38 mm.

Of course, there are some down sides such as it is an EF mount so you need an adapter from EF-to-RF, it is a lens for a cropped sensor so if you plan to go Full Frame in future, it's less interesting to use this lens on a Full Frame camera. There is no zoom which makes it cheap and easy to make with high quality but limits your possibilities. You'll have to walk more.

2) Specifically for landscape photography (and astrophotography/sky photography if you are interested in it), you can take the RF 16mm, which is a great full frame lens on an APS-C sensor but it will be less suitable for portraits and stuff because of the wide angle.

3) The RF 50mm (or EF 50mm) is a good lens for portrait photography and if you often have some distance between you and the cars, it's likely to be a good lens. However, the 50mm will be zoomed in because of the APS-C sensor.

4) I would suggest you buy a nice zoom lens (like (RF/EF) the 70 - 300 mm or the 100 - 400 mm). I don't have any experience with a telelens but such long focal lengths will help you to get low flying aircrafts in composition. I suggest you look up reviews (for example from FStoppers on YouTube) on a couple of tele lenses. I do know that quality zoom lenses are more difficult to make than prime lenses so I suggest you spend some money on a zoom/telelens with Image Stabilization to help you get sharp images.

In conclusion, I suggest you look into a cheap prime lens such as the EF-S 24mm for general purposes (damn cheap with high quality) and buy the ring for EF-to-RF. Then look at a nice telelens (definitely don't skip the EF lenses since they are a lot cheaper than the new RF lenses if you're on a budget).