Below given are some Tips ;

Research the Job and the Company
Visit the company's web site and if they don't have one or it doesn't fit with how they describe the company, consider that a red flag. How professional is it? Is there contact information? Are jobs and career information posted on the site?

Google It or Internet IT
Use Google to research the company. Search by the company name (if the company won't give you a name, don't bother applying) to see what information you can find. Take it one step further and search by "company name scam" to see if you can find information about reported scams.
The Job Details
If it isn't listed in the job posting, try to find out if there's a salary or if you're paid on commission. Ask how much you're paid, how often are you paid, and how you are paid. If the company doesn't pay an hourly rate or a salary, carefully investigate the details.

Do Not Pay
Do not pay money - for anything. Legitimate employers don't charge to hire you. Don't send money for work at home directories, advice on getting hired, company information or for anything else related to a job.

Check the Company's References
References work both ways. You are as entitled to check a company's references, as they are to check you out. Ask for references if you're not sure if the company is legitimate. Request a list of other employees or contractors. Then, contact the references to ask how this is working out. If the company isn't willing to provide references (names, email addresses, and phone numbers) do not consider the opportunity.

Forget Getting Rich Quick
Avoid listings that guarantee you wealth, financial success, or that will help you get rich fast. Stay clear of listings that offer you high income for part-time hours. They will do none of the above.

Be Careful
If it sounds too good to be true, you can be sure it is. Also, read any "offers" you get very carefully. One candidate for employment got a very detailed job offer from an employer. The only problem was that she hadn't applied for the job and buried deep within the lines was a request for her bank account information, so the employer could pay her. It was a scam, of course, but with some of the well-written ones it can be hard to tell.
And most importantly if the Employer ask you to Give your Details like

1: Name
2: Address
3: Mobile Phone
4: Bank Account
5: National Insurance
6: Passport Details