Help yourself means take as much as you want without asking. Help yourself to tea, do help yourself, help yourself, everybody.
It takes to before the thing offered, and it is the standard hospitable instruction at a table. Said coldly about somebody who took without permission, it means the opposite.
1phrasehelp yourselfTake as much as you want without asking.
“There is bread on the side, so help yourself.”
help yourself is a phrase.
Practised in Small Talk & Everyday Phrases