This paper presents a comprehensive study of high-redshift galaxies using the James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec) prism observations of 482 confirmed sources at \(z \geq 5\). The authors construct spectroscopic templates to represent the average properties of these galaxies, focusing on their spectral features and line ratios. Key findings include: 1. **Spectral Templates**: The study derives composite spectra of high-redshift galaxies, which are used to interpret individual sources and provide a new observational benchmark for high-redshift galaxy evolution. 2. **Spectral Features**: - **UV Continuum Slopes**: Galaxies at \(z \geq 5\) are characterized by blue UV continuum slopes (\(\beta = -2.3\) to \(-2.7\)), indicating dust-poor and young systems. The slopes become bluer and the systems younger with increasing redshift. - **Inverse Balmer Jumps**: The Balmer break shifts from a positive to an inverse Balmer jump, reflecting evolving stellar populations and decreasing dust content. - **Line Emissions**: Ubiquitous detections of C III] emissions (EW0 = 5-14 Å) increase with redshift, while rest-frame optical lines show elevated ratios (O32 = 7-31, R23 = 5-8, Ne3O2 = 1-2) and subsolar metallicities (\(\log (O/H) = 7.3-7.9\)). 3. **Lyα Emitters**: - 57 Lyα-emitters are identified and compared to non-emitters, revealing more extreme ionizing conditions, enhanced C III], C IV, and He II+[O III] line emissions, and younger stellar populations. 4. **Global Properties**: - The study derives global galaxy properties such as star formation rates (SFRs) and stellar masses, showing a clear trend of increasing SFR with stellar mass across different redshift bins. - The consistency of these properties with the high-redshift main sequence suggests that the sample is representative of typical star-forming galaxies. 5. **Selection and Methods**: - The sample selection includes 482 confirmed sources from various JWST/NIRSpec programs and lensing cluster fields. - Quality control and magnification corrections are applied to ensure the reliability of the spectra. - Stacking methods are used to create composite spectra, which are then fit with galaxy templates to derive continuum models and emission line fluxes. 6. **Implications**: - The study provides a detailed spectral characterization of high-redshift galaxies, challenging existing models and offering new insights into early galaxy evolution. - The derived spectral templates can be used to interpret individual high-redshift sources, enhancing our understanding of their global properties and extending observations to the earliest cosmic times. This work representsThis paper presents a comprehensive study of high-redshift galaxies using the James Webb Space Telescope (JWST) Near Infrared Spectrograph (NIRSpec) prism observations of 482 confirmed sources at \(z \geq 5\). The authors construct spectroscopic templates to represent the average properties of these galaxies, focusing on their spectral features and line ratios. Key findings include: 1. **Spectral Templates**: The study derives composite spectra of high-redshift galaxies, which are used to interpret individual sources and provide a new observational benchmark for high-redshift galaxy evolution. 2. **Spectral Features**: - **UV Continuum Slopes**: Galaxies at \(z \geq 5\) are characterized by blue UV continuum slopes (\(\beta = -2.3\) to \(-2.7\)), indicating dust-poor and young systems. The slopes become bluer and the systems younger with increasing redshift. - **Inverse Balmer Jumps**: The Balmer break shifts from a positive to an inverse Balmer jump, reflecting evolving stellar populations and decreasing dust content. - **Line Emissions**: Ubiquitous detections of C III] emissions (EW0 = 5-14 Å) increase with redshift, while rest-frame optical lines show elevated ratios (O32 = 7-31, R23 = 5-8, Ne3O2 = 1-2) and subsolar metallicities (\(\log (O/H) = 7.3-7.9\)). 3. **Lyα Emitters**: - 57 Lyα-emitters are identified and compared to non-emitters, revealing more extreme ionizing conditions, enhanced C III], C IV, and He II+[O III] line emissions, and younger stellar populations. 4. **Global Properties**: - The study derives global galaxy properties such as star formation rates (SFRs) and stellar masses, showing a clear trend of increasing SFR with stellar mass across different redshift bins. - The consistency of these properties with the high-redshift main sequence suggests that the sample is representative of typical star-forming galaxies. 5. **Selection and Methods**: - The sample selection includes 482 confirmed sources from various JWST/NIRSpec programs and lensing cluster fields. - Quality control and magnification corrections are applied to ensure the reliability of the spectra. - Stacking methods are used to create composite spectra, which are then fit with galaxy templates to derive continuum models and emission line fluxes. 6. **Implications**: - The study provides a detailed spectral characterization of high-redshift galaxies, challenging existing models and offering new insights into early galaxy evolution. - The derived spectral templates can be used to interpret individual high-redshift sources, enhancing our understanding of their global properties and extending observations to the earliest cosmic times. This work represents