What are the most used types of web testing??

i think the answer above by Fadi Alkhateeb have alot of good informations, but i can add more methods of web tests * - Cookies testing: test the application by enabling or disabling the cookies in your browser options.
Test if the cookies are encrypted before writing to user machine.
If you are testing the session cookies * -Validate your HTML/CSS *- Database testing *- Compatibility Testing: Compatibility of your web site is very important testing aspect.
See which compatibility test to be executed: Browser compatibility Operating system compatibility Mobile browsing Printing options *- Stress testing: Generally stress means stretching the system beyond its specification limits.
Web stress testing is performed to break the site by giving stress and checked how system reacts to stress and how system recovers from crashes.
Stress is generally given on input fields, login and sign up areas.

Am not aware alot of what most used, however below list of Software testing types: Black box testing – Internal system design is not considered in this type of testing.
Tests are based on requirements and functionality.
White box testing – This testing is based on knowledge of the internal logic of an application’s code.
Also known as Glass box Testing.
Internal software and code working should be known for this type of testing.
Tests are based on coverage of code statements, branches, paths, conditions.
Unit testing – Testing of individual software components or modules.
Typically done by the programmer and not by testers, as it requires detailed knowledge of the internal program design and code.
may require developing test driver modules or test harnesses.
Incremental integration testing – Bottom up approach for testing i.e continuous testing of an application as new functionality is added; Application functionality and modules should be independent enough to test separately.
done by programmers or by testers.
Integration testing – Testing of integrated modules to verify combined functionality after integration.
Modules are typically code modules, individual applications, client and server applications on a network, etc.
This type of testing is especially relevant to client/server and distributed systems.
Functional testing – This type of testing ignores the internal parts and focus on the output is as per requirement or not.
Black-box type testing geared to functional requirements of an application.
System testing – Entire system is tested as per the requirements.
Black-box type testing that is based on overall requirements specifications, covers all combined parts of a system.
End-to-end testing – Similar to system testing, involves testing of a complete application environment in a situation that mimics real-world use, such as interacting with a database, using network communications, or interacting with other hardware, applications, or systems if appropriate.
Sanity testing - Testing to determine if a new software version is performing well enough to accept it for a major testing effort.
If application is crashing for initial use then system is not stable enough for further testing and build or application is assigned to fix.
Regression testing – Testing the application as a whole for the modification in any module or functionality.
Difficult to cover all the system in regression testing so typically automation tools are used for these testing types.
Acceptance testing -Normally this type of testing is done to verify if system meets the customer specified requirements.
User or customer do this testing to determine whether to accept application.
Load testing – Its a performance testing to check system behavior under load.
Testing an application under heavy loads, such as testing of a web site under a range of loads to determine at what point the system’s response time degrades or fails.
Stress testing – System is stressed beyond its specifications to check how and when it fails.
Performed under heavy load like putting large number beyond storage capacity, complex database queries, continuous input to system or database load.
Performance testing – Term often used interchangeably with ‘stress’ and ‘load’ testing.
To check whether system meets performance requirements.
Used different performance and load tools to do this.
Usability testing – User-friendliness check.
Application flow is tested, Can new user understand the application easily, Proper help documented whenever user stuck at any point.
Basically system navigation is checked in this testing.
Install/uninstall testing - Tested for full, partial, or upgrade install/uninstall processes on different operating systems under different hardware, software environment.
Recovery testing – Testing how well a system recovers from crashes, hardware failures, or other catastrophic problems.
Security testing – Can system be penetrated by any hacking way.
Testing how well the system protects against unauthorized internal or external access.
Checked if system, database is safe from external attacks.
Compatibility testing – Testing how well software performs in a particular hardware/software/operating system/network environment and different combination s of above.
Comparison testing – Comparison of product strengths and weaknesses with previous versions or other similar products.
Alpha testing – In house virtual user environment can be created for this type of testing.
Testing is done at the end of development.
Still minor design changes may be made as a result of such testing.
Beta testing – Testing typically done by end-users or others.
Final testing before releasing application for commercial purpose.

Thank you for the answers :)