I need good explanation for generic classes

Question

class Stack<T> {
int index=0;
T[] innerArray = new T[100];
public void Push(T item) {
innerArray[index++] = item;
}
public T Pop() {
return innerArray[--index];
}
public T Get(int k) { return innerArray[k]; }
}

Answer 1

for anyone here do you think that solo learn is good enough to cover the basics of programming
if yes give me a percentage.