Stuck between 2 careers

I’m lately noticing at start-ups people don’t hire someone only for knowing rl but they want me to know the full robotics stack like Ros 2, Linux, slam etc so they both go hand in hand..? I’m someone who is having 0 experience in robotics and only know rl, so is it true or what? I’m a physics major I’m learning stm 32 rn and the startup is an autonomous vehicle start-up.. So looking forward for help and the time I have is 2 months or will I be identified as a robotic enginner with a focus on rl