Hello! First of all feel free to join the discord and ask questions in the speed-score-run channel, there is lots of helpful people in there. https://discord.com/invite/rainworld

1. The best tech to learn for beginners imo is slides, rolls, extended slide and fast pole climb (fpc) you can find them in the movement doc here https://docs.google.com/document/d/1o3gouaiHsHT2H9d2HD5gDhgmoWwoL94gSFt7Ka1-vDk/edit#heading=h.ibdwg0v51mwb

2. Generally most players favour keyboard, as the fast pole climb is substantially easier to do on it.