You should SEE EVIDENCE of your students' learning EVERYDAY. Exit Slips are an excellent way to ensure that your students are reflecting on their learning as well as a way to keep tabs on their progress.
Growth mindset visuals. A Poster for students with alternatives and behavior reminders. This one is good, because it is not a "do this" don't do that" poster. It is recommendations for situations that may arise often in class such as being confused about a topic or feeling discouraged because they don't understand
Think Before You Speak Printable Posters. Really cute and effective posters and signs for teachers to post on their walls in order to keep hurtful words out of the classroom and teach their students what appropriate behavior is. - Carly Knoche
This "Worry Tree" is a poster I would love to hang in my classroom. It is a resource I think students could refer to, when needed, to help them regulate their emotions and deal with their "problems" in an effective way. Eventually, they will be able to follow this process on their own, and develop their emotional competence - which is an important skill that underlies positive mental health (Reinke et al., 2011).