WW1 ....was trench war fare and the trench stalemate was finally broken when the first tanks were built and aerial bombing began ...WW2 ... was a highly mechanized war with all sorts of tanks ...machines ... planes ... fighters and bombers ... naval battles ...very different from WW1
WW II was a much broader scale. In the Pacific, there was "Island hopping." This was used to simply cut off the supply line and literally starve them into surrender. In Europe, it began with heavy bombardment from the air followed by numerous harrowing beach assaults. Once a foothold had been gained, it was a matter of moving the tanks, men and materiel. Advances there were based around taking bridges, roads and railways. The biggest trick was to not out-run your own supply-line
The basic "tactic" of WW I was to shell the ever livin' hell out of them (several days of non-stop heavy cannon fire) and then at the sound of a whistle, launch the men who would try and come out of their trenches, march forward through the barbed wire and close on a machine gun nest who would then mow them down. Digging in well, the men could withstand any amount of shelling.
The tactics of 1918 were the earliest beginnings of the Blitzkrieg tactics of 1939. In 1918 there were tanks, and ground attack planes, and there were even plans to use airborne troops in 1919 by the Americans.
WWI, from late 1914 to early 1918 on the Western Front was a deadlocked position. Neither side could force the other back any significant amount. Defensive weapons predominated. Stupidly, the leaders on both sides bashed their armies to bits before they really had an answer to the problems of trench warfare. The French leadership was the most stone-brained, charging the German positions in France with huge courage and no hope of success.
The machines of WWII were much better, and enabled a superior application of the newer tactical ideas.