Deep Learning, Ian Goodfellow, Yoshua Bengio, and Aaron Courville, 2016 (MIT Press) - Chapters on 'Optimization for Training Deep Models,' 'Regularization for Deep Learning,' and 'Empirical Evaluation of Deep Models' provide comprehensive theoretical and practical insights into loss functions, metrics, overfitting, and the role of validation sets.
Guide to training and evaluation, fchollet, 2023 (TensorFlow) - The official Keras documentation provides a direct and up-to-date guide on how to configure and monitor model training, including using model.fit, interpreting the History object, and specifying loss functions and metrics.