You asked
Best budget lens for the leica m10 p?
Here is what the site says about that.
From Leica M10-P: Leica M10-P: A rangefinder by Leica with a 24-megapixel full frame sensor, announced in 2018. An M10 with a quieter shutter and a touchscreen. Specs - Maker: Leica - Mount: Leica M - Sensor: Full frame, 36 x 24mm, crop factor 1.0 - Resolution: 24 megapixels - Stabilisation: none in the body; use stabilised lenses for slow shutter speeds - Announced: 2018 - Type: rangefinder Focal lengths on it Full frame is ...
From Your first camera: How to split the budget: Spend roughly as much on lenses as on the body, or more. A modest body with a great lens takes better pictures than a flagship body with a cheap zoom. A sensible first kit: 1. The body with its kit zoom, for everything. 2. A cheap fast prime, a 50mm f/1.8 or its APS-C equivalent, for people and low light. See lenses. 3. A spare battery and a decent memory ...
Quoted from this site's pages.