This is the 5218th most frequent Portuguese word.
pesquisar
To research or search.
Here, 'pesquisar' is used in the past tense to indicate an action of seeking information actively.
Eu pesquisei muito sobre o assunto antes da reunião.
I researched a lot about the subject before the meeting.
In this case, 'pesquisar' is used in the present tense imperative form to suggest actively searching for information.
Você pode pesquisar mais informações na biblioteca.
You can search for more information at the library.
Here, 'pesquisando' denotes present continuous activity of actively exploring or studying a topic.