Your course objectives indicate the focus on the course and what students will learn. Strong learning-centered objectives can help direct the activities you do in class, the assessments you give, and ultimately what your students get out of the class.
The end of a semester is a great time to look back on your successes and areas for improvement. For TAs, this reflection should also focus on your teaching and any potential changes you want to make the next time you teach.
Grading is a common responsibility for Graduate Teaching Assistants. Effective grading means providing useful information to the students about their performance. Learning to grade fairly and efficiently can help save you time in the long run.
A positive classroom culture helps all students to be successful in your classroom. For TAs and instructors, this means considering the classroom power differential and how you interact with students both inside and outside of the classroom.
Classes have begun and for many graduate students that means teaching, perhaps for the first time. Learning to teach well takes time and getting feedback on your teaching will help you continue to improve.