If I want to see the milky-way, what kind of telescope should i buy? Can I use a regular telescope and see the milky-way in cities at night, where light pollution is pretty heavy? Or should I go find somewhere without light?
To observe the Milky Way, you don't necessarily need a telescope. In fact, under dark skies away from city lights, the Milky Way can be seen with the naked eye as a faint, milky band stretching across the sky. However, a telescope can help you see more details and explore specific regions or objects within the Milky Way.

For casual stargazing and observing the Milky Way, a pair of binoculars or a small, portable telescope with a wide field of view would be sufficient. Some popular telescope types for this purpose are:

Refractor telescopes: These use lenses to focus light and are generally low-maintenance, with good image quality. A refractor telescope with an aperture of 70-100mm and a focal ratio of f/5 to f/7 would work well for wide-field views of the Milky Way.
Dobsonian telescopes: These are a type of reflecting telescope with a simple, easy-to-use design, known for their large apertures and affordable prices. A Dobsonian with an aperture of 6-8 inches (150-200mm) would be a good choice for observing the Milky Way and deep-sky objects.
In cities with heavy light pollution, it can be challenging to see the Milky Way, as artificial light washes out the faint glow of the galaxy. While a telescope can help you see some celestial objects, it won't be able to cut through the effects of light pollution. To get the best view of the Milky Way, it's highly recommended to find a dark location away from city lights. Dark sky parks, rural areas, and high-altitude locations are ideal for observing the Milky Way and other faint celestial objects.

Additionally, consider using a light pollution filter for your telescope or camera to help reduce the effects of light pollution and improve the contrast of your observations. These filters work by selectively blocking the wavelengths of light emitted by common artificial light sources while allowing the light from celestial objects to pass through.
What are another useful tip  to allow our eyes to adapt to the darkness?