thank you so much for this information
"get" is the base form of the verb, "got" is the past tense and "gotten" is the past participle. If you check any verbs in your dictionary, you usually see these three forms. for instance if you check the verb "eat", you will probably see "ate/past tense" and "eaten/past participle" as well.
Some examples for each:
Present tense: I usually GET my clothes from this store. BUT She usually GETS her clothes from this stoe.
Past tense: I GOT her message a few minutes ago.
Present Perfect: They have gotten more threats since her arrival.