Having difficulty understanding data structures

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C++

data

structures

Hello :)

I'm studying software engineering at the university, And i have missed part of a very important course (Data Structures) due to illness and that is why I have now difficulties to get started. So i wonder how can i as a beginner learn data structures properly I'm having problems in understanding and implementation?
I understand the principle behind simple things like stack and linked list, but my biggest problem is how to implement it, so i wonder if you guys have any tip, videos ..mm that can help me with this ?

Thank you in advance.

What I have tried:

How i have tried to implement stack using c++.

#ifndef ISTACK_H
#define ISTACK_H

template <typename T>
class IStack
{
	public:
		virtual ~IStack() = 0 {};
		virtual void push(const T& element) = 0;
		virtual T pop() = 0;
		virtual T peek() const = 0;
		virtual bool isEmpty() const = 0;
};

#endif