Ridgeline in Eugene is beginner friendly but heard the mtb section is currently closed for trail work. Check the map for open to mtb trails
Thurston Hills in Springfield has a nice green line Acer Spades. There is a group that rides there on Tuesday nites, Show up after 5 leave the parking lot at 5;30, (FB page- Eugene Mountain Bike Group). They will ride some trails wirh rocky tread (YewHaw)
Carpenter Bypass near Lorane is a network of trails, many are beginner friendly. I plan to ride there today, noon at North parking lot (gravel pile), I drive a green Tacoma and you are welcome to join me. Forum back if you plan to show.
Regarding riding fast , getting technical, and not falling, good luck with that. You’re new to mtb, learn to ride first, fall a few times, gain confidence then speed and tech…then fall some more.
Hey Justin Bogart here, would love to plan rides with people. I mainly ride in Oakridge in the winter due to mud but open to anything (incl. BMX/DJ). I don’t have a car but can split gas. Feel free to text me (805 729 6621) or reply here if you want to ride. I know a few good spots.