I don’t care that your Professor at Uni said it. I don’t care that some rando YouTube “guru” told you. I don’t care that you have convinced yourself of it.
PHOTOSHOP IS NOT FOR DESIGNING LOGOS.
If you want to be serious about the craft of logo design; if you want to build a following of both clients and other designers; if you want to design logos the proper way; then you need vector software.
Vector logos can be scaled to any size without losing quality and becoming pixelated. You could save a vector logo, in it’s original format, at 1″ x 1″ and send the file to your print shop to have them blow it up for a billboard – no loss of quality.
Stop using software that was created for Photo editing and manipulation to create logos.