Chapter 1. Introduction to Neurotechnology: History and Interdisciplinary Innovations.- Chapter 2. Non-Invasive Brain Signal Acquisition Techniques : Exploring EEG, EOG, fNIRS, fMRI, MEG, and fUS.- Chapter 3. Invasive Brain Signal Acquisition Techniques: SUA, MUA, LFP, ECoG in Neuroimaging and Recording.- Chapter 4. Preprocessing Techniques for Brain Signal Data: Noise Reduction and Artifact Removal Methods.- Chapter 5. Machine Learning with Brain Data: Feature Engineering and Analysis Methods.- Chapter 6. Neuromodulation in Neural Circuits: Neurotransmitters and Synaptic Plasticity.- Chapter 7. Invasive Brain Stimulation Techniques: DBS for Neurological and Psychiatric Disorders.- Chapter 8. Non-Invasive Brain Stimulation Techniques: TMS, tDCS, and tACS Methods.- Chapter 9. Brain Stimulation Theory and Techniques: Comparative Analysis and Applications.- Chapter 10. Neurofeedback Basics and Applications: Techniques, Benefits, and Ethical Considerations.- Chapter 11. Neurotechnology for Communication: ALS Patient Case Study and BCI Development.