Hi, WEN!

I’m on WP for 5 years, and did not see the obvious – you use build-in Media Gallery option, not some custom script or plugin, that I was looking for 😉

Here is a little bit updated version:

a. Go to New, Page, Crate a page “Gallery”.

1. In your Gallery page click Add Media button just above the content editor section.
2. Then appears a new window. On the left column of this panel select Create Gallery.
3. Upload new images or select the existing ones and click Create a new gallery button on bottom right of the panel.
4. Opens up a new panel, select Attachment Page option in Link to settings. Select no. of columns, image size , etc according to your design and requirements.
5. Then click Insert Gallery button. You will get the shortcode inserted into your content editor. Give this image gallery a title for e.g. Adventure

It looks something like this:

Adventure

[gallery link="file" ids="770,769,768,767,766"]
You can create more galleries under different titles by repeating same steps as above.