Depends if you’re using a graphical login manager or not. If so, you’ll have to search the name of it and ‘autologin’ in your favourite search engine. Its typically no more then checking a box and adding your username.
I dont use a graphical login manager, I just let it boot up and agetty (from util-linux) logs me directly into my shell (because I added -u ’ to the config.). Then my shell profile takes care of starting the graphical environment for me.
Its just personal choice but I dont see any point in a login manager when Im the only one logging in. I understand that it may come as part of the desktop suite though. I prefer to start with nothing and add what I want versus getting everything and removing what I dont want