Regard (v.) is to consider or to have an opinion about something:
Picasso is regarded as one of the greatest artists in history.
I don't regard this as a problem; I regard it as an opportunity.
Regards (n.) is a greeting:
Please give my regards to your parents when you see them.
Some people end their letters/emails with the expression Regards, or With best regards,
The phrases regarding and in/with regard to mean "related to / concerning the following topic":
Have you read the report regarding the economic crisis?
Before finalizing the contract, there are a few points I'd like to clarify with regard to the deadlines.
These phrases are more formal, and in everyday spoken English we'd say "about" instead: "Have you read the report about the economic crisis?"
Regardless (adv.) means one thing is not affected by something else:
A champion keeps going, regardless of the difficulties.
The mayor approved the new law regardless of the opposition from the public.
I know we don't have all the information, but we still need to make a decision, regardless.
As you can see from the examples, the action (keep going / approving the law / making a decision) is not affected by the other situation (the difficulties / the opposition / not having all the information).
Don't use the word "irregardless" - it doesn't exist; it is a common error in English.
They are the birds of open sagebrush plains and are the largest Grouse species that are present in North America. The appears to be somewhat like large chicken birds and most of the time they are grayish in color having the belly of black hue with long tails and spiky long feathers covering their body. Like all the other species of grouse the male has no interest in growing of the kids and they display on the dancing grounds called as leks. Female can visit the leks for the purpose of mating and then raise their brood all by themselves.