The circuit implemented is a 1-bit adder cell based on np cmos dynamic logic design. It's the first digital circuit I have ever designed and simulated using an EDA tool.
Initial task was to learn how an NP CMOS logic works in order to get a better grasp on circuit. Then the stage wise working of reference circuit was examined. Drawing the schematic was so easy, thanks to eSim UI.
Next the netlist was generated and I had to figure out how exactly the inputs (pulse characteristics) must be given so as to get the outputs as precisely shown in the reference waveform. And the simulation results obtained were almost perfectly similar to the reference waveform.     
The 10-bit DAC design using eSim and Sky130 course on Udemy helped a lot in getting started. I could easily proceed with my design due to the excellent and error-proof explanation.
The only major problem I faced was in understanding how a proper netlist and control statement can be scripted for ngspice as I had mostly used a GUI based simulation before. 
The wonderful technical support through the slack channel resolved even my silliest doubts as a fresher.  
