Lichess is free and has a pleasant UI, unlike Chess.com which is very busy and not particularly "friendly". As your victories mount, it will move you into higher level competition. Not bad. But, Lichess likes to play Big Brother and if you either walkaway or in my case, time-out while thinking-out moves. In Blitz, it will put you into a time-out like a wayward child. Not sure, but I think they also slow-down the rate at which they match you up with games, and/or match you up with lower-level players. Further, they won't respond to emails at *******@lichess.org, which I think is irresponsible. So, Lichess is... better than nothing.