I earlier had dual-booted my MacBook Pro(2013), Catalina OS with Ubuntu 18.04 LTS. I wished to remove it, so I erased the unwanted partition in disk utility and restarted my mac, it did not show the macOS symbol in refind so I started in internet recovery mode. Afterwards, I
followed step by step till the step where I removed my third and second partitions. Since my MacBook is working on Catalina OS and the guide was given according to the Sierra, I refrained from going further. Please help me out since I'm not that terminal savvy.