In the US, it is uncommon for many verbs to be changed to past tense using a t instead of an ed. For example, it is far more common to hear dreamed or spoiled or learned (as a single syllable in addition to the other meaning pronounced with two syllables) than dreamt or spoilt or learnt. For American English speakers who use the t variant, it tends to be colloquial.
However, this is different in British English, where t past tense forms are far more common.
Of course, there are past forms of verbs that use ONLY the t form, like kept, lost, and felt.
Which form, of those that have variants, are you more likely to use, and where are you from?