Create sidebars through an admin interface and apply widgets. Using conditions, apply the sidebars to certain pages / posts depending on what you select.
<h3>Versions</h3>
<ol>
<li>Version 1.0 – Initial Release</li>
<li>Version 1.1 – Passed slug to dynamic_sidebar at end of control mechanism (lost in original changes)</li>
</ol>

Sidebars

Create and apply sidebars to certain pages / posts.

Andrico

A wonderful plugin to easily create many custom sidebars. These sidebars can then select in the creation of a post / page / custom post type / category / taxonomy. We give an order, and select several at once. 
You will see all active sidebars instead of seeing just one.
VISIT https://wordpress.org/plugins/advanced-widgets/
Español:
Un maravilloso plugin para poder crear fácilmente muchos sidebars. Estos sidebars luego los podremos seleccionar en la creacián de un post / page / custom post type / category / taxonomy. Podremos darle un orden, y seleccionar varios a la vez. 
Se verán todos los sidebars activos.
VISITAR https://wordpress.org/plugins/advanced-widgets/

Multiple Sidebars

A wonderful plugin to easily create many custom sidebars. These sidebars can then select in the creation of a post / page / custom post type / categor …

Sidebars vs Multiple Sidebars