How do you input alpha?

Excuse me, could you please elaborate on how exactly one inputs the Greek letter "alpha" in various contexts? Is it a straightforward process that differs based on the software or platform being used, or does it require specific knowledge or steps to be taken? I'm particularly interested in understanding the methods for inputting "alpha" in programming languages, text editors, and perhaps even specialized financial software related to cryptocurrency and finance. Would you kindly guide me through the process, highlighting any nuances or considerations I should be aware of?