what simple programs/projects demand abstraction/interface usage in C#?

i want to get familiar on using abstract classes and interfaces in C#,
i've read about how they work; trying to understand how And when to use them.
what simple programs or project ideas that i could practice on the use of abstraction and interfaces?

GBase 8a Implementation Guide: Resource Assessment
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1. Disk Storage Space Evaluation The storage space requirements for a GBase cluster are calculated based on the data volume of the business system, the choice of compression algorithm, and the number of cluster replicas. The data volume of a business s... […]
A Look Into Netflix System Architecture
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Ever wondered how Netflix keeps you glued to your screen with uninterrupted streaming bliss? Netflix Architecture is responsible for the smooth streaming experience that attracts viewers worldwide behind the scenes. Netflix's system architecture emphas... […]
High Availability and Disaster Recovery (HADR) in SQL Server on AWS
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High Availability and Disaster Recovery (HADR) play a vital role in maintaining the integrity of data, reducing downtime, and safeguarding against data loss in enterprise database systems. AWS offers a range of HADR options for SQL Server, which levera... […]
Terraform Tips for Efficient Infrastructure Management
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Terraform is a popular tool for defining and provisioning infrastructure as code (IaC), improving consistency, repeatability, and version control. But you need to know how to use it properly to extract maximum value from it as an infrastructure managem... […]
Integration Testing With Keycloak, Spring Security, Spring Boot, and Spock Framework
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In today's security landscape, OAuth2 has become a standard for securing APIs, providing a more robust and flexible approach than basic authentication. My journey into this domain began with a critical solution architecture decision: migrating from bas... […]