I've read of the trench warfare of the Western front, the brutality of the Eastern front, but I don't know anything about the "African front." This map posted in /r/mapporn shows a European jigsaw across the continent. Were the Nigerians fighting Cameroon? What was the war there like? Did they build trenches? Did tanks or planes play any significant role in Africa? Did the separation of colonies by neutral countries like Spain effect tensions?
The German colonies were occupied pretty quickly, by about 1915, with the exception of German East Africa. Despite being ordered not to, Paul Von Lettow-Vorbeck led a German-African force on a guerrilla style campaign that involved detours into Kenya, Mozambique, and Belgian Congo, surrendering about a week after the Armistice due to lack of contact with his outside authorities.
Although the internet has lionized him for his efforts, Lettow-Vorbeck's campaign ended in massive use of scorched policy, and in the targeting of native, African porters, which combined with resulting starvation, probably killed c. 1 million Africans during and after the war. To top it off, the amount of allied forces tied down by him was negligible in the grand scheme of things. /u/NMW has done a review of the campaign on a blog [here] (https://thewpb.wordpress.com/2013/07/29/paul-von-lettow-vorbeck-a-different-view/), that examines the impact it had on the population.
I think a good source for what the war was like in Africa is Tip and Run by Edward Paice. He does a good job of bringing out the nature of the fighting in Africa. There was nothing like the trench lines of the western front, and only a few planes, whose only significant role was spotting for naval guns trying to sink the German Commerce raider Konigsberg that was blockaded in a river in German East Africa. East Africa was too much of a side show.
As for the war in East Africa it had several stages. The first involved German Askari (African troops, most of the soldiers on both sides in this fight were black by the end) raiding into British territory, blowing up trains and fighting a guerrilla war to try and hold down as many British soldiers as they could. The Germans only fought two battle during this period. One was against a landing at Tanga, where Indian army troops were landed by the British to begin the conquest of the colony, and were soon driven back. The other was a rather inconsequential battle by a place called Jassini. The most important thing about that battle is that the German shot off some 200,000 rounds of ammunition. In his post war memoir on page 63 Von Lettow-Vorbeck says "The expenditure of 200,000 rounds also proved that with the means at my disposal I could at most fight three more actions of this nature. The need to strike blows only quite exceptionally, and to restrict myself principally to gureilla warfare, was evidently imperative." (side note: Von Lettow-Vorbeck's memoirs are accessible on archive.org) For the rest of the war Von Lettow-Vorbeck would avoid battle, trying to delay the end. The next stage began with the arival of the South Africans, fresh from the conquest of German West Africa and the suppression of a Boer revolt. The General in command, Jan Smuts, who had fought against the British in the Boer War advanced into German East Africa with overwhelming force, and the German gave way before them. There was very little fighting just a lot of marching. This is where the real tragedy of the fighting begins.
Two things about German East Africa. It had only two railroads that both went from the coast straight inland, which meant they could not be used to carry supplies to the troops. East Africa was also infested with the TseTse Fly that carried sleeping sickness. That meant that beast of burden such as cows and horses brought into East Africa died quickly, so they could not be use to carry supplies. The only thing that really could were men. Both the Germans and the British forced hundreds of thousands of East Africans to carry supplies, and the British were eventually forced to take Africans from all over their empire, as well as some supplied from French and Portuguese Colonies in order to try to keep the fighting men supplied. In many cases these efforts were not much different from the slave raids of old. The porters had to carry heavy weights from dawn till deep in the night in order to try to keep up with the advance. Health care for these men was almost nonexistent, food was scarce, and beatings not uncommon. After the war many would never return to their homes, either struck down by disease or over work, or just cut loose in a strange land. All of this for a supply system that didn't work, as most of the time the soldiers marched too fast for the poor porters to keep up.
When most of German East Africa was overrun around 1917 Jan Smuts and the white troops were withdrawn, Smuts to a position running the whole war, and the white troops because they were suffering horribly from disease. Von Lettow-Vorbeck was still active, cutting loose most of his forces and streamlining down to a flying column to continue the fight. He evaded the efforts of the remaining British troops, mostly by this time Black troops of the Kings African Rifles, to force an end to the fighting until 25 November 1918, when a British officer told him of the armistice.