I see people are voting to close this as too broad. Well, it is broad, but I'll try to give you some pointers. I used to wonder this stuff too, like "why use 10k and not 20k or 5k?". A good starting point is to watch some of Dave Jones' EEVblog videos.
For example Designing a Li-Ion Battery Gauge with the LM3914 - EEVblog #204 - this is already 5 years old. He has done a lot of them. This particular one describes using the LM3914 chip to make a battery gauge, and in the middle he works through the resistor values using Ohm's Law.
Another entertaining and informative blog is Afrotechmods. He also goes into detail but in a humorous way.
Also try M J Lorton's blog.
My only problem with videos is, if you are trying to reproduce some of their stuff you end up having to rewatch a (perhaps lengthy) video and pause it from time to time to copy stuff off the screen.
For this reason I made some posts of my own on the Electronics part of my own forum. (Some of the more popular ones are also here in Stack Exchange as reference questions, for example How do you use SPI on an Arduino? How do you use SPI on an Arduino?).
You could also look at the Adafruit and Sparkfun tutorials (amongst many others).
I see people are voting to close this as too broad. Well, it is broad, but I'll try to give you some pointers. I used to wonder this stuff too, like "why use 10k and not 20k or 5k?". A good starting point is to watch some of Dave Jones' EEVblog videos.
For example Designing a Li-Ion Battery Gauge with the LM3914 - EEVblog #204 - this is already 5 years old. He has done a lot of them. This particular one describes using the LM3914 chip to make a battery gauge, and in the middle he works through the resistor values using Ohm's Law.
Another entertaining and informative blog is Afrotechmods. He also goes into detail but in a humorous way.
Also try M J Lorton's blog.
My only problem with videos is, if you are trying to reproduce some of their stuff you end up having to rewatch a (perhaps lengthy) video and pause it from time to time to copy stuff off the screen.
For this reason I made some posts of my own on the Electronics part of my own forum. (Some of the more popular ones are also here in Stack Exchange as reference questions, for example How do you use SPI on an Arduino?).
You could also look at the Adafruit and Sparkfun tutorials (amongst many others).
I see people are voting to close this as too broad. Well, it is broad, but I'll try to give you some pointers. I used to wonder this stuff too, like "why use 10k and not 20k or 5k?". A good starting point is to watch some of Dave Jones' EEVblog videos.
For example Designing a Li-Ion Battery Gauge with the LM3914 - EEVblog #204 - this is already 5 years old. He has done a lot of them. This particular one describes using the LM3914 chip to make a battery gauge, and in the middle he works through the resistor values using Ohm's Law.
Another entertaining and informative blog is Afrotechmods. He also goes into detail but in a humorous way.
Also try M J Lorton's blog.
My only problem with videos is, if you are trying to reproduce some of their stuff you end up having to rewatch a (perhaps lengthy) video and pause it from time to time to copy stuff off the screen.
For this reason I made some posts of my own on the Electronics part of my own forum. (Some of the more popular ones are also here in Stack Exchange as reference questions, for example How do you use SPI on an Arduino?).
You could also look at the Adafruit and Sparkfun tutorials (amongst many others).
I see people are voting to close this as too broad. Well, it is broad, but I'll try to give you some pointers. I used to wonder this stuff too, like "why use 10k and not 20k or 5k?". A good starting point is to watch some of Dave Jones' EEVblog videos.
For example Designing a Li-Ion Battery Gauge with the LM3914 - EEVblog #204 - this is already 5 years old. He has done a lot of them. This particular one describes using the LM3914 chip to make a battery gauge, and in the middle he works through the resistor values using Ohm's Law.
Another entertaining and informative blog is Afrotechmods. He also goes into detail but in a humorous way.
Also try M J Lorton's blog.
My only problem with videos is, if you are trying to reproduce some of their stuff you end up having to rewatch a (perhaps lengthy) video and pause it from time to time to copy stuff off the screen.
For this reason I made some posts of my own on the Electronics part of my own forum. (Some of the more popular ones are also here in Stack Exchange as reference questions, for example How do you use SPI on an Arduino?).
You could also look at the Adafruit and Sparkfun tutorials (amongst many others).