Both your computer and the computer to which you want to connect should be connected to the same Wi-Fi network in order for you to access their shared files.  If you're connected to the other computer via an Ethernet cable, you should be able to access the shared files. If your router has different channels (e.g., 2.4 GHz and 5 GHz), it's okay for the computers to use different channels as long as they're using the same network name (SSID). Click the folder-shaped File Explorer app icon in the taskbar to do so. You can also just press ⊞ Win+E, or type file explorer into Start and then click File Explorer when it appears. It's on the left side of the File Explorer window, though you may need to place your cursor on the left-hand sidebar here and scroll down to view it. This will bring up a list of all your currently connected network items. You should see it in the main window. Doing so will open a login form. If you don't see the computer's name, right-click a blank spot on the page and click Refresh. If the computer still doesn't appear, make sure file sharing is turned on for the computer. In the pop-up window which appears, type in the other computer's username and password. It's at the bottom of the window. As long as you enter the correct username and password for the other computer, this will allow you to open any folders you see in the Network window. You may even be able to add files and folders or edit the existing ones if the other computer allows it.
Make sure you're using the correct network. Open File Explorer . Click Network. Double-click the computer's name. Enter the other computer's login information. Click OK. Browse the other computer's shared folders.