The tool used to fix edging around trees, garden beds, and walkways is known by different names. Weed eaters, weed whackers, or string trimmers accomplish the same thing. The oldest gas-powered string trimmers have been used for years. A benefit to gas-powered trimmers is mobility is heavy-duty and great for large areas of land.
Another option is electric, needs a cord and best for smaller lots.
And battery operated trimmers, that offer mobility and are rechargeable.
Whichever you choose you will be able to invest in a tool that beautifies and keeps your lawn looking its best.