Hi Aldert,

Here are some of the sites where you can sell your laptop online sitting at your home in Boston.

1. Facebook Marketplace
Launched in October 2016, Facebook Marketplace is an outgrowth of the buying and selling that happens in Facebook Groups. More than 450 million people use groups on Facebook for buying or selling every month, according to the social network.
The idea behind Marketplace is to enable commerce between individuals within the same local communities, while removing some of the uncertainty of sites such as Craigslist. After all, if you can see a seller or buyer profile on Facebook, you're more likely to be comfortable doing business with that person. Payments are made through Facebook or any other method sellers and buyers agree on.
The service isn't perfect, though. Marketplace is currently a part of the Facebook smartphone app. It's also only available in the United States, United Kingdom, Australia and New Zealand. You can't rate buyers or sellers, and it doesn't work with Pages, only personal accounts.

2. Amazon
Amazon (mostly) makes it easy to sell your stuff.

3. eBay
Online auction site eBay has been a popular place to sell used tech for years, thanks largely to its active user base of 165 million members, as estimated by Statista. In recent years, eBay made it easier to list items for sale. You can start by searching for your item, and eBay recommends an auction format based on previous sales.

4. Gazelle
Gazelle takes much of the hard work out of selling unwanted cell phones, tablets and Macs. You tell the site what you have to sell, it gives you a price, and then you ship it off to Gazelle for free. The site will even send you a box. It pays via PayPal, Amazon Gift Card or by check.
This summer, Gazelle began to offer self-service kiosks where you can drop off items for instant cash, though the price you receive is "a bit lower" than what you'd get otherwise, according to the company. Kiosks can also be hard to come by; I couldn't find any when I searched in San Francisco.

I hope this helps.

Regards,
Lokesh