This is a Free Go := Tutorial for Beginners made by Mike Van Sickle on freecodecamp
>> Variables (22min)
>> Primitives (29 min)
>> Constants (11 min)
>> Arrays and Slices (40 min)
>> Maps and Structs (31 min)
>> If and Switch Statements (33 min)
>> Looping (20 min)
>> Defer, Panic, and Recover (22 min)
>> Pointer (18 min)
>> Functions (24 min)
>> Interfaces (36 min)
>> Goroutines (32 min)
>> Channels >(34 min)
for more Advantage Courses of Mike you can find here