"lo" it is used as pronoun direct object third sigunlar or plural male or neuter, for example "I eat it"= "yo me lo como", or "I feed the cat"= "Alimento al gato" "Lo alimento" or "I get the boy up"="levanto el niño"="Lo levanto" when direct objet is a female pronoun I use "la" "I get the stone up"=Levanto la piedra"="la levanto"
For the indirect object female, male o neuter it is used the same pronoun "le" "I give a gift to him"="Le doy un regalo" "le"="a él" o a "ella" "I give a gift to her"="Le doy un regalo"