Spanish-language course chapter on basic electronics, provided as an 817 KB PDF and apparently the same content as the numbered topic 2 of the series. It is not linked to any device or board. Lessons like this usually cover voltage, current, resistance, Ohm's law, series and parallel circuits and common passive and active components, forming the groundwork for reading schematics and measuring with a multimeter. It is useful for trainees before moving on to fault finding on phone motherboards and can be opened in any PDF viewer.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @canalesquematicos. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.