Here are some resources for getting started with TAK. All the credit to content owners. Resources are public and collected from clear web. links:
https://drive.google.com/drive/u/1/folders/1GuY-MVWnlo3vlM7FEiDn8Nd3H_AXMpKn
https://www.civtak.org/2023/03/29/tak-best-practices-security-guide/
https://www.offgridweb.com/gear/tactical-awareness-kit-tak-ultimate-guide/
https://github.com/TAK-Product-Center/Server