Incorporating some form of assessment into your instruction sessions gives you the opportunity to reflect and improve upon your teaching practice and make meaningful, data-driven decisions. It also provides an avenue through which to communicate the impact of your teaching to others.
There are a variety of tools and methods for conducting assessment and each will result in a different type of data or information. How and what you choose to assess should stem directly from your student learning outcomes.
These assessment techniques can be done on paper or index cards, or using Google Forms, which can be embedded into a course guide.
If you have developed a strong working relationship with a faculty member, additional assessments can also be performed.
Assessment is an ongoing, cyclical process. Goals are the entry point, and it is important to consider how to "close the loop", by directing findings into actionable steps that feed back into goals.