Render

[xEmilezz]

How to quickly and automatically render video chunks when there are a lot of them? Please suggest a solution for a beginner

[MyerPj]

You left out the little red/yellow/green bar across the top of the timeline, which indicates when Red that you need to render to playback. It is Render you want, right? IE: Export is to create the new file (like when your done with the edit), Render is to get the timeline to play in real time, while you are working on it. 

Show a bigger screen shot.

[xEmilezz]

I need to render all pieces by minute at once. all video pieces are divided by 1 minute. it is very long and tedious to render one piece at a time. is there any way to render all of them at once? 30 pieces by 1 minute.

[Peru Bob]

I need to render all pieces by minute at once. 

By @xEmilezz

Lasso all the clips or Control + A to select all.  Make sure the Work Area Bar is above all clips, or you have in and out points, and then press Enter to render the timeline to create preview files.

[MyerPj]

On the Sequence menu up top, there are a bunch of options for Rendering. You can press Enter on the numeric keypad, which will render your entire sequence.

[MyerPj]

Somehow I think you are not wanting to 'Render'. But maybe Export, but I asked and you said Render, seemingly ignoring the question I posed.