I am new to Arm Development, How do I start?

Ricardo Yoga said:

I would like to start with some simple 32/64-bit development board

I don't think anything 64-bit is going to be simple.

I would recommend that you get a manufacturer's own board from one of the big names - they will be well documented, well supported, and will have specific examples, tutorials, etc.

Be sure to get a board with built-in debugger:  you don't want the hassle of having to source, configure, and connect a separate one at this stage. They are pretty much de rigueur these days anyhow - so anything without one is really behind the times...

EDIT

See: https://www.avrfreaks.net/comment/3097061#comment-3097061

Also: community.arm.com/.../170550

Ricardo Yoga said:

I would like to start with some simple 32/64-bit development board

I don't think anything 64-bit is going to be simple.

I would recommend that you get a manufacturer's own board from one of the big names - they will be well documented, well supported, and will have specific examples, tutorials, etc.

Be sure to get a board with built-in debugger:  you don't want the hassle of having to source, configure, and connect a separate one at this stage. They are pretty much de rigueur these days anyhow - so anything without one is really behind the times...

EDIT

See: https://www.avrfreaks.net/comment/3097061#comment-3097061

Also: community.arm.com/.../170550

what are the big names companies?

Andy Neil said:

I don't think anything 64-bit is going to be simple.

You can do something like a Raspberry Pi.  You get a lovely development environment(s), a wide choice of languages, and learn an entirely different class of "embedded" by running applications underneath a "real" operating system.

Interfacing with sensors/etc through an OS like Linux is rather different than interfacing at bare hardware level (AFAIK), but is still a useful skill.  And the actual applications can be arbitrarily "simple" despite the hidden complexity of ... everything.