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1. Super key: Opens Activities search  (Windows key!)
2. Ctrl+Alt+T: Ubuntu terminal shortcut
3. Super+L or Ctrl+Alt+L: Locks the screen
4. Super+D or Ctrl+Alt+D: Show desktop
5. Super+A: Shows the application menu
6. Super+Tab or Alt+Tab: Switch between running applications
7. Super+Arrow keys: Snap windows
8. Super+M: Toggle notification tray
9. Super+Space: Change input keyboard (for multilingual setup)

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1. You mast have a public key from your mashine stored on github as SSH key here: 
https://github.com/settings/ssh

How to create ssh key on unix/mac os x:
 - Open terminal, go to the root typing: $ cd ~ (recommended)
 - Type: ssh-keygen -t rsa -C "your@email.address"
 - To secure your ssh key ststem will ask you for passphrase (recommended) but you can skip it also
 - That's you have the ssh key
 - Check it with: $ ls -al ~/.ssh

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PostgreSQL is Enough

• Just Use Postgres for Everything
• Simplify: move code into database functions
• Hacker News discussion

Background and Cron Jobs

• https://github.com/citusdata/pg_cron
• https://github.com/cybertec-postgresql/pg_timetable

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Please follow these steps to point your domain name from namecheap domain to the Netlify nameservers:

- Having logged into Namecheap account, go to your Domain List -> click 'Manage' next to the domain website.com -> locate the 'Nameservers' section;
- Choose ‘Custom DNS’ in the drop-down menu;
- Fill in your custom nameservers into empty lines;
4 lines in total :

dns1.p03.nsone.net
dns2.p03.nsone.net
dns3.p03.nsone.net

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Problem: Every push prompt me to input username and password.
I would like to avoid it for every push, but how to configure to avoid it?

Answer: Using SSH authentication on terminal.

1. Generate an SSH key

Linux/Mac
Open terminal to create ssh keys:

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You want to push your local files to remote files

git push -f <remote> <branch>

git push -f origin master

Local version has priority over the remote one!

more...

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# Double Colon (::) is namespace resolution. It can also call Class Level Constants. So when you do this:

MyModule::MyClass::MySubClass
MyModule::MyClass::MySubClass::CONSTANT

# it is calling the name space of:
module MyModule
    class MyClass
        class MySubClass
            CONSTANT = 'test'

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##

* ORM is Object Relational Mapper. It means you don't have to manually call the database yourself; the ORM handles it for you.
* Ruby on Rails uses one called ActiveRecord, and it's a really good one.
* ORM allows you to do things such as:
      User.find(50).contacts
      Instead of manually writing a SELECT statement with JOINs, WHEREs, etc.
      
**********

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Below are the setups to run Ruby on Rails application on your system.

Make sure Ruby is installed on your system. Fire command prompt and run command:

ruby -v
Make sure Rails is installed

rails -v
If you see Ruby and Rails version then you are good to start, other wise Setup Ruby On Rails on Ubuntu

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Initial Steps

*1) Press Windows Key + R. *2) Enter CMD and press Enter.

Execute it

Write command in the cmd:

shutdown /s /t 3600