Explain the difference between indirect and direct object pronouns and their usage

Why do we use object pronouns?: to make phrases more natural/fluid and to limit repetition. For example, it would be very unnatural to say ‘I bought the chocolate and then I ate the chocolate’, or 'I love my sister and I gave a present to my sister'.  (The direct object nouns are shown in bold and the indirect object nouns are shown in bold italics.) Direct Object Pronouns: First Person Singular: me First Person Plural: nos Second Person Singular: te Second Person Plural: os Third Person Singular: lo, la Third Person Plural: los, las *Note: lo/la, los/las change depending on the gender of the direct object noun (e.g. el coche = lo, las manzanas = las). Direct object pronouns replace the direct object noun in a sentence. The direct object noun is the thing (e.g person/object/idea) that receives the action from a verb. For example, 'Como el chocolate' - I eat the chocolate. Here, 'Como' = verb & 'el chocolate' = direct object noun (it is being eaten, receiving the verb's action). In order to use the direct object pronoun, you simply swap it with the direct object noun.For example, 'lo como' - I eat it. *Placement of object pronouns - object pronouns go before the verb, however they can go at the end of infinitives and gerund verbs: e.g lo como, lo quiero comer OR quiero comerlo, lo estoy comiendo OR estoy comiéndolo (don't forget accents to maintain word syllable stress) Indirect Object Pronouns: First Person Singular: me First Person Plural: nos Second Person Singular: te Second Person Plural: os Third Person Singular: le Third Person Plural: les **Note: Indirect Object Pronouns do not change according to gender. The indirect object noun in a sentence tells us to whom or for whom an action was done. For example, 'Doy el regalo a mi hermano' - I give the present to my sister. Here, 'doy' = verb, 'el regalo' = direct object noun & 'mi hermano' = indirect object noun. So, let's swap the indirect object noun (a mi hermano) for the indirect object pronoun (le): 'le doy el regalo'. It's very common to use both direct and indirect object pronouns in sentences. Together, they work in exactly the same way as practiced above, but the indirect object pronoun goes before the direct object pronoun (e.g. 'Me lo dan' - They give me it). ***Note: When using the third person indirect and direct object pronouns together (le & lo), we have to change something because it is simply too awkward to pronounce le and lo together. So, we change le to se.  However remember (!), in this case se is NOT a reflexive pronoun, it is just le disguised as se. For example, 'le se lo doy' - I give him it. ****Note: there are not a set group of indirect and direct object nouns, but rather their indirect and direct object status depends on the way they are used.