By standing up for them
Listening to them
Hearing what they say
Commiserating with them
By understanding
Not judging them
Be there when they need you.
Enjoying times of celebration together
Stand firm when you're protecting them from danger
Help them to understand boundaries and expectations - what they can & can't do & more importantly why.
Knowledge of what transitions are, how difficult they can be and what reassurance is so that you can help make sure the experience/transition is a positive one.
and by knowing why you work with the age group you're with and what the aim of the setting/placement you're in is - what do they want to provide for the children.
All of this can be done through play, discussion times, circle times, whilst outdoors or in, reading books, mark making, chatting with parents.
And by providing resources that help explore social & emotional developmental issues.
Books with titles and content that look at emotions, feelings, moods, sharing, turn taking, family members, friends ..
Toys that look at cultural diversity - role play dress up & items.
Activities that include how to care for yourself and others eg: a tooth brushing activity or maybe you change the soap/fragrance for hand washing when you let the children know what you've done ensure they know they can pass on their feedback/thoughts about it at anytime.
Routines that allow children to express their preferences, emotions and to question things - snack, toilet, story times, line up times, home time, registration, the relationship & way you chat with parents/carers.
This is the welsh framework for learning -
foundation phase - scroll down to page 17 for a more indepth look at what supporting social & emotional development can mean.
Hope this helps a little
xx