machine learning - How to know if model is overfitting or

I understand that using cross validation we can validate our model, but it is also possible that maybe our model is underfitting; hence, providing wrong results. One possibility that I can think of

Overfitting, and what to do about it

How to Detect & Prevent Machine Learning Overfitting

Overfitting and Underfitting

Underfitting and Overfitting in Machine Learning

4 – The Overfitting Iceberg – Machine Learning Blog

How to detect and prevent overfitting in your Machine Learning

Overfitting vs Underfitting in Machine Learning [Differences]

How to Avoid Overfitting - KDnuggets

Techniques for handling underfitting and overfitting in Machine

Learning Curve to identify Overfitting and Underfitting in Machine