pleas correct this sentence

Dear all,

Please explain the words highlighted in red


Find a Niche

For small businesses, it is best to find a niche. A small company with limited

resources can efficiently serve niche markets. Concentrate your

efforts on a fairly narrow market offering. This entails sticking to

what you do best, and becoming an expert in that field. Realize that

it is not possible to be good at everything. By concentrating on a

fairly narrow market niche, you may be able to avoid head-on

collision with bigger competitors. If you are a hardware store

selling everything from paints to lumber, the entry of giant

retailers like Home Depot in your area can spell the end for your

business. However, you can try to limit your offering, for example,

to construction of porches and decks and be the best retailer for

this segment

thanks.