Ortografía means "spelling", a word you'd expect in a classroom, not a love song! This is what makes its use here so clever and unique.
In the lyrics, the singer says, "Hoy te escribo sin pensar y sin ortografía" (Today I write to you without thinking and without spelling). He uses this academic word to show he is so overcome with raw, unfiltered emotion that he's throwing the rules out the window. It's a beautiful metaphor for a love that's too passionate for perfect grammar.
Colombian folk-pop band Morat brings us a sweet track about falling for a total stranger and wanting to do things the right way. Right away, the singer admits he was hit with "una mezcla de miedo con locura" ("a mix of fear and craziness") the moment he saw her. He doesn't know her past or her worldview ("no sé nada de tu historia, ni de tu filosofía"), and he's so nervous and impulsive that he is writing to her without overthinking or even checking his spelling: "hoy te escribo sin pensar y sin ortografía".
Instead of pretending to be a smooth expert in romance, he treats loving someone like an earnest subject he needs to study. The core chorus promise is simple: "Para aprender a quererte, voy a estudiar cómo se cumplen tus sueños" ("To learn how to love you, I will study how your dreams come true") and "voy a leerte siempre muy lentamente" ("I will read you always very slowly"). He frames a healthy relationship in cute math terms too, promising "una vida con más sumas que restas" ("a life with more addition than subtraction"). It is an honest, upbeat pledge to listen closely, learn her world, and build something where neither person has to second-guess the answers.