Thanks to：

Aperture：

1. How to Choose Your First Telescope from SKY and Telescope

2. How to Pick the Best Beginner Telescope

3. How To Avoid The Agony When Buying Your First Telescope - Telescope Articles

4. How to Choose a Telescope

Magnification：

1. How to Choose Your First Telescope from SKY and Telescope

2. How to Pick the Best Beginner Telescope

3. How To Avoid The Agony When Buying Your First Telescope - Telescope Articles

4. How to Choose a Telescope

Focal Length：

1. How to Choose a Telescope

2. How to Choose Your First Telescope

The Mount：

1. How to Choose Your First Telescope from SKY and Telescope

2. How to Pick the Best Beginner Telescope

3. How To Avoid The Agony When Buying Your First Telescope - Telescope Articles

4. How to Choose a Telescope

Finders：

1. https://spectrumscientifics.wordpress.com/2016/02/25/telescope-tips-finder-scopes-vs-red-dot-reflex-finders/

2. https://stargazerslounge.com/topic/187779-red-dot-finder-vs-finderscope-which-is-best/

3. https://www.cloudynights.com/topic/737049-finder-scope-vs-red-dot/

4. https://stellafane.org/tm/dob/ota/finders.html