You can't quite win, can you?
The first tutorial is OK, but contains an old blunder concerning the wiring of the contrast potentiometer and with comments closed, that cannot be corrected. Not critical, but slightly inconvenient. It shows a very old version of the 1602 display, not the one presently available, but again, not a critical problem. In many details, a good explanation.
The YouTube tutorial shows in nauseating detail, an effective but inconvenient display design using obsolete ICs. Either the 1602 LCD(, preferably a version with backpack and using the proper HD44780 library) or PaulRB's suggestion would be far more sensible.