The main take production in WWI is 20 [A7V](https://en.wikipedia.org/wiki/A7V) in total so not a lot. The used more captured tanks as around 50 British Mark IV tanks was used.
The answer how to aim and hit targets was to manually turn them and fire. The guns that they The A7V used [5.7_cm_Maxim-Nordenfelt](https://en.wikipedia.org/wiki/5.7_cm_Maxim-Nordenfelt) was not new and used in fortification and as field guns before the usage in tanks. So they dud ut exactly the same way. You have optical sight and move it by hand or by turning handles
But as all tanks even in WWII hitting anything at any distance when you move was almost impossible so you stoped the tank to fire. It is with electronic stabilization in 1970 you had an efficient fire on the move. There was a hydraulic system before that but not as good. Some were even used back in WWII like in the Sherman but it was more one of the aim behind cover and you then drive forward and stop and the gunpoint int the same direction.
There was quite an advanced optical system for artillery back in the day with the most advanced use on battleships.
I remember hearing that panzer started to be used in the interwar period and they were called tanks even in german during WWI and the early interwar period but I can’t find a source now.
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