Jumping straight to vehicles might be much. But you can definitely start hacking away at small iot devices or routers. They usually have poor/no security and are a great way to get your feet wet.

There are whole youtube channels dedicated to reverse engineering small consumer devices.

Not the same guy. But I’ve been using foldables since 2019 as my primary phone. Samsung fold 1 -> 3 -> 5. No case, no protectors, keys with phone in same pocket. Never had an issue.