A tech stack defines the area of technical requirements that will be addressed using a particular technology.
It provides a complete overview about how your project will be developed and handled with respect to front end back end and database.
Check Your Requirements
Defining the requirements properly claims to solve half of the problem for you as it defines how the project development will go about
Analyse The Scope
Scope is the main criteria that provides you answers where this technology helps you to solve the business problem
Time To Market
Choose a tech stack that provides a custom solution for all your needs for example a frontend a backend and a db.
Assess how your tech fits into the scalability factor for future expansions
Security needs to be addressed for user data safety form malicious intents and attacks
All in all a tech stack defines how your business problem will be solved.