khattab88

## cs50 understanding tech (2- internet).txt
- we can connect to intenet using DSL modem, which is connectd through ISP (internet service provider).
- we can use home Router to brodcast wi-fi signal around the area.

- every computer on the network (ex: internet) must has an IP address
- ISP can provide a unique IP address using DHCP server (Dynamic Host Configuration Protocol)
- inside home area (within wi-fi network) your router could assign IP addresses to multiple devices (labtops, phones, ...)

- DNS servers (Domain Name System) maps an IP address of a website (which is running on some machine on the internet)
  into human-readable names (like facebook.com, ....)

## cs50 understanding tech (3- multimedia).txt
Audio:

- MIDI (Musical Instrumental Digital Interface): compuer-generated audio standard

- audio file formats:
  - .WAV (uncomressed)
  - .mp3/.MPEG (compressed)
  - .AAC


## cs50 understanding tech (4- security).md

      
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                khattab88
                / cs50 understanding tech (4- security).md
            
            
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              June 26, 2020 16:05
            
          
    security

cs50 security

  
## gitignore exsisting files.txt
https://stackoverflow.com/questions/45400361/why-is-gitignore-not-ignoring-my-files

git rm -r --cached .
git add .

git commit -m "Untrack files in .gitignore"

## security-best-practices.txt
1. compromised database
  - strongly encrypt passwords with salt and hash (bcrypt)
  - strongly encrypt password reset tokens (sha256)

2. brute-force attacks
  - use bcrypt (to make login request slow)
  - implement rate limiting (express-rate-limit)
  - implement maximum login attempts

 3. cross-site scripting (xss) attacks

## sql.txt
** Maurach's SQL Server 2012 for Developers

- Queries:
  (select, distinct, where)
  (AND, OR, NOT)
  (like, IsNull)
  (orderby)

- Joins:
  (inner, outer, cross, self)

## Adding-ASP.NET MVC5 Identity-Authentication-to-existing-project
https://stackoverflow.com/questions/31960433/adding-asp-net-mvc5-identity-authentication-to-an-existing-project/31963828

## git_with_visual_studio.txt
https://developercommunity.visualstudio.com/t/error-encountered-while-pushing-to-the-remote-repo-3/308898

Solution for me:

Close VS
Delete (or rename) folder "C:\Program Files (x86)\Microsoft Visual Studio\2017{Community|Professional|Enterprise}\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Git"
Open VS and try to push a commit to a remote repo!

## ts-compiler-issue.txt
https://github.com/microsoft/TypeScript/issues/35606

run this command on powershell
Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope LocalMachine

## create_new_repo_and_push_to_github.txt
git init
git add README.md
git commit -m "first commit"
git branch -M main
git remote add origin {github repo}.git
git push -u origin main
	- we can connect to intenet using DSL modem, which is connectd through ISP (internet service provider).
	- we can use home Router to brodcast wi-fi signal around the area.

	- every computer on the network (ex: internet) must has an IP address
	- ISP can provide a unique IP address using DHCP server (Dynamic Host Configuration Protocol)
	- inside home area (within wi-fi network) your router could assign IP addresses to multiple devices (labtops, phones, ...)

	- DNS servers (Domain Name System) maps an IP address of a website (which is running on some machine on the internet)
	into human-readable names (like facebook.com, ....)
	Audio:

	- MIDI (Musical Instrumental Digital Interface): compuer-generated audio standard

	- audio file formats:
	- .WAV (uncomressed)
	- .mp3/.MPEG (compressed)
	- .AAC
	https://stackoverflow.com/questions/45400361/why-is-gitignore-not-ignoring-my-files

	git rm -r --cached .
	git add .

	git commit -m "Untrack files in .gitignore"
	1. compromised database
	- strongly encrypt passwords with salt and hash (bcrypt)
	- strongly encrypt password reset tokens (sha256)

	2. brute-force attacks
	- use bcrypt (to make login request slow)
	- implement rate limiting (express-rate-limit)
	- implement maximum login attempts

	3. cross-site scripting (xss) attacks
	** Maurach's SQL Server 2012 for Developers

	- Queries:
	(select, distinct, where)
	(AND, OR, NOT)
	(like, IsNull)
	(orderby)

	- Joins:
	(inner, outer, cross, self)
	https://developercommunity.visualstudio.com/t/error-encountered-while-pushing-to-the-remote-repo-3/308898

	Solution for me:

	Close VS
	Delete (or rename) folder "C:\Program Files (x86)\Microsoft Visual Studio\2017{Community\|Professional\|Enterprise}\Common7\IDE\CommonExtensions\Microsoft\TeamFoundation\Team Explorer\Git"
	Open VS and try to push a commit to a remote repo!
	https://github.com/microsoft/TypeScript/issues/35606

	run this command on powershell
	Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope LocalMachine
	git init
	git add README.md
	git commit -m "first commit"
	git branch -M main
	git remote add origin {github repo}.git
	git push -u origin main