Data Structures

https://www.tutorialspoint.com/java/java_data_structures.htm

https://www.tutorialspoint.com/data_structures_algorithms/

http://www.java2novice.com/data-structures-in-java/

http://www.studytonight.com/data-structures/introduction-to-data-structures 

Context Driven Testing

http://www.softwaretestinghelp.com/what-is-context-driven-testing/

Component Testing

http://www.softwaretestinghelp.com/what-is-component-testing-or-module-testing/

Security in Web Services

http://www.guru99.com/security-web-services.html

WSDL – Web services description language

http://www.guru99.com/wsdl-web-services-description-language.html

RESTful Web Services

http://www.guru99.com/restful-web-services.html

SOAP – Simple Object Access Protocol

http://www.guru99.com/soap-simple-object-access-protocol.html

Appium - Creating Framework from Scratch

https://www.youtube.com/watch?v=fCrpi_or7zU

Appium - Basic Script

https://www.youtube.com/watch?v=Nu3BDv2opxE

http://www.software-testing-tutorials-automation.com/2015/10/appium-run-first-android-automation.html

Appium - UiAutomator Viewer

http://www.guru99.com/uiautomatorviewer-tutorial.html

http://www.software-testing-tutorials-automation.com/2015/09/locating-android-app-elements-using-ui.html

http://smritituteja.in/android-automation-uiautomator/

https://www.youtube.com/watch?v=aV3NfkkmbEY

https://www.youtube.com/watch?v=wpmLvbEZ6wA

http://www.software-testing-tutorials-automation.com/2015/10/ui-automator-viewer-get-android-app.html 

Appium - Installation & Setup

http://www.guru99.com/introduction-to-appium.html#4

https://www.youtube.com/watch?v=5rUIT9KxheE

http://www.software-testing-tutorials-automation.com/2015/09/how-to-download-and-install-appium-in.html

http://www.software-testing-tutorials-automation.com/2015/09/install-other-required-software-for.html

Hadoop - MapReduce

https://www.youtube.com/watch?v=SqvAaB3vK8U

Hadoop - Overview

https://www.tutorialspoint.com/hadoop/hadoop_introduction.htm

https://www.youtube.com/watch?v=tu7nCsHImbI

Hadoop - Ecosystem

https://www.youtube.com/watch?v=-XkEX1onpEI

Hadoop - HDFS Architecture

https://www.youtube.com/watch?v=m9v9lky3zcE

IoT - Overview

http://www.softwaretestinghelp.com/internet-of-things-iot-testing/

www.forbes.com/sites/jacobmorgan/2014/05/13/simple-explanation-internet-things-that-anyone-can-understand/

https://www.tutorialspoint.com/internet_of_things/internet_of_things_overview.htm

DevOps - Overview

https://theagileadmin.com/what-is-devops/

https://www.youtube.com/watch?v=4o99zq77KBE

Role of QA in DevOps

http://www.cigniti.com/blog/what-is-the-role-of-qa-in-the-world-of-devops/

MongoDB - Aggregation

https://www.youtube.com/watch?v=J_L6r_v3hss

https://www.tutorialspoint.com/mongodb/mongodb_aggregation.htm

MongoDB - BackUp and Restore

https://www.youtube.com/watch?v=ilcwtzi92Cs

https://www.tutorialspoint.com/mongodb/mongodb_create_backup.htm

MongoDB - Sort, Skip, and Limit

https://www.youtube.com/watch?v=P0iQBL81qrw

https://www.tutorialspoint.com/mongodb/mongodb_sort_record.htm

https://www.tutorialspoint.com/mongodb/mongodb_limit_record.htm

MongoDB - Indexing

Articles

https://www.tutorialspoint.com/mongodb/mongodb_indexing.htm

Videos

https://www.youtube.com/watch?v=vj_YkHxzF2s

MongoDB - Projection

https://www.youtube.com/watch?v=dO3sWwJUv04

https://www.tutorialspoint.com/mongodb/mongodb_projection.htm

MongoDB - Delete Document

https://www.youtube.com/watch?v=-rcvh5aMyW8

https://www.tutorialspoint.com/mongodb/mongodb_delete_document.htm

MongoDB - AND OR Conditions

https://www.youtube.com/watch?v=1avpbijGmBw

MongoDB - Update Document

https://www.youtube.com/watch?v=0x7myKJqI44

MongoDB - Query Document

https://www.youtube.com/watch?v=FH4XRY6h8Fg

MongoDB - Insert Documents

https://www.youtube.com/watch?v=TCT5ulUzfR8

https://www.tutorialspoint.com/mongodb/mongodb_insert_document.htm

Mongo DB - Create & Drop Collections

https://www.youtube.com/watch?v=9RqMh282OGc

https://www.tutorialspoint.com/mongodb/mongodb_create_collection.htm

https://www.tutorialspoint.com/mongodb/mongodb_drop_collection.htm

MongoDB - Create & Drop DB

https://www.youtube.com/watch?v=NcW07q9FiAc

https://www.tutorialspoint.com/mongodb/mongodb_create_database.htm

https://www.tutorialspoint.com/mongodb/mongodb_drop_database.htm

MongoDB - Installation

https://www.youtube.com/watch?v=GtD93tVZDX4

https://www.youtube.com/watch?v=WH5GgHaEy7E