I want to develop my concentration and to reach access concentration please give me tips and advice or book recommendations ..
​​​​​​ if once you reach access concentration can you reach it whenever you want or it's just a one time thing? 
​​​​​​​thank you in advance

Hello, Aya. Read this book by Leigh Brasington:

Right Concentration: A Practical Guide to the Jhanas

Two of the biggest obstacles to concentration are stress and mental fatigue. I find that relaxing meditation is very helpful in developing access concentration.

https://ncu9nc.blogspot.com/2020/08/preparing-for-meditation-with.html

If you try the above link, once you are fully relaxed sit up and do sitting meditation. I use that as a samatha type practice that I do as preparation for insight meditation.


I go by this definition of access concentration by Leigh Brasington:

http://www.leighb.com/accesscon.htm

Leigh Brasington has a lot on his web site

http://www.leighb.com/index2.html

http://www.leighb.com/accesscon.htm

http://www.leighb.com/jhanas.htm

http://www.leighb.com/jhana3.htm

http://www.leighb.com/jhana2a.htm

etc.

Google this -
site:www.dharmaoverground.org concentration

Whatever your searching for on this site..... Substitute concentration for what you want to search for.... Lots of old posts with lots of good stuff.
Good luck,
​​​​​​​~D

Hi Aya R Bh,

Leigh Brasington's book is a must. But Jim's suggestions on relaxation as foundational work are great too. 

Check also for tips and inspirational stuff below:

Shargrol'ls posts on Centering

Daniel's posts on Concentration

For critiques and other ways of thinking about the situation with "access concentration", I recommend David Johnson's book The Path To Nibbana. There's a free PDF of it.

I wrote up some tips here: https://www.dharmaoverground.org/discussion/-/message_boards/view_message/25580295#_com_liferay_message_boards_web_portlet_MBPortlet_message_25626845

If I understand access concentration correctly (e.g. https://www.accesstoinsight.org/lib/authors/gunaratana/wheel351.html#ch1.3), it's a pretty low-level state, a prelude to jhana. If that's accurate, it's not a one-time thing; you can pretty much access it whenever you want (although it may be difficult in times of extreme emotion).