1. Learn symbols of components.
2. Learn identify components in circuit board
3. Learn how the wiring diagrams be drawn
This is good start
after that learn theory of components and basic electrical calculations.
Start with these...................................
Welcome to the Electronics Club
Schematic Diagram Symbols
Here you find many electronics kits with circuit boards and shematics
try to find manuals for assembly and read them.
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few examples...............................
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Try to find more kits and manuals. ( other manufacturers )
Google different schematics and pictures of electronic components
Google different datasheets of components etc...
Here in Edaboard you can always ask help in your studies
Regards KAK