Can anyone using my wifi see what I'm browsing?
Well, that depends. If you are not being attacked (MITM, other users in promiscuous mode etc...) then the other users on your LAN can't really inspect your traffic, but your ISP can. Even if your traffic is encrypted, the ISP can't see exactly what you're visiting but it can use unencrypted information to gain some knowledge about your internet traffic and browsing activity, such as your DNS queries which are usually unencrypted. This can be suffice for your ISP to know most of the domains you visit etc...
Also your ISP could analyze your traffic patterns (or other unencrypted metadata) and extract useful information. For example, according to this article every youtube video has a unique traffic pattern when streamed to your device so if someone has access to your traffic, even if it is encrypted he can extract useful information. Those kind of attacks are called side channel attacks. Now if you are under attack, with what your ISP can do by default, the attacker can do also or worse.
Tor safe for this issue?
Tor or VPN in general, can be used to tunnel your traffic and hide/protect it from potential attackers. In this case even your ISP can't see as much information as before, but it knows that you are using Tor/VPN etc... Though, you must be sure that the VPN/Tor servers are legit and trustworthy. For example, in my opinion you shouldn't use Tor to transmit sensitive information since nothing guarantees that the servers your traffic gets tunneled through are trustworthy.