If you are working mostly with landscapes you can save a lot of hard disk space if you set the Preview size to Standard at import. Lightroom creates a smaller preview in this case and it processes the details only when you zoom in. The factory setting of the Standard Preview is 1440px but if you are using retina or a 4k display you need to bigger standard preview.
Just go to Edit > Catalog Settings menu and in the File Handling tab you can find the Standard Priview Size dropdown. Set it to 1680 pixels or 2048 pixels to a full HD and 2880 pixels for a retina or 4k monitor.
This is a sexist tip, only for male. I realized, females used to drag the sliders in Lightroom while the picture looks best, but guys always want the values to be round. Values like 79 bother us, 80 looks much better isn’t it?
If you like the values divisible with 10 (or the exposure correction in 1/3 or 1/10 step) this tip is for you. Just click on the slider and use the arrow key for smaller or hold Shift key while pressing the arrows if you need bigger steps.
The next tip is useful, when you want to quickly develop several photos taken in same lighting situation and camera angle. You might know when you are ready with the adjustment select all the other photos in the Develop module and press Copy/Paste buttons at the left or the Sync button at the right. With these you can apply the settings of your developed photo to the other – selected – ones.
But, if you are not sure about the actual development, you can switch on the little switch on the Sync… button and it turns to Auto Sync. After that, all the changes you make on the images will be applied to the others.
You might know, that if you double click on a slider, the value of the slider resets. But I bet, you don’t know, how can you reset all the sliders in a block. You just have to press and hold ALT and the title of the block is changing to Reset… Now, click on it, and all the sliders in the block reset.