Beginner level to advance level ,through the course you can be expert in modflow , and you can easily built different models like extended pumping test model, contaminant transport etc
also you can get the links for all the tutorials of the course
tutorial 1    • Tutorial 1: How to Install Processing...  
tutorial 2    • Tutorial 2: Introducing Modflow Envir...  
tutorial 3    • Groundwater Flow Modeling Using Modflow  
tutorial 4    • Tutorial 4: Groundwater Flow Modellin...  
tutorial 5    • Tutorial 5: Groundwater flow modellin...  
tutorial 6    • Tutorial 6: Groundwater flow usnig  M...  
tutorial 7    • Tutorial 7:  groundwater flow modelli...  
tutorial 8    • Tutorial 8: Groundwater flow modellin...  
tutorial 9    • Tutorial 9: using real data and inter...  
tutorial 10    • Tutorial 10:Transient Groundwater flo...  
tutorial 11    • tutorial 11: Time Variant specific he...  
tutorial 12
groundwater flow modelling using processing modlfow
horizontal barriers modflow
injection and production well modflow
recharge modflow
pathline modflow
production well