Where you place only affects the meaning of your sentence.
I only went to the store.
means that of your planned tasks (going to the store, riding your bike, and planting your garden), all you did was go to the store.
What you probably meant to say was:
I went only to the store.
In most cases only belongs before a noun rather than a verb.
I want only executives to attend.
She purchased only three copies of the sales guide.
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