DaVinci Resolve

Views

The views are on the bottom bar in the middle and are Media, Cut, Edit, Fusion, Color, Fairlight and Deliver

Timelapse

To create a timelapse from images (stills), basically you rename all your images so they are in order and then you drag them into the media pool (button underneath the menu bar) You select them all, right click them and then choose "create new timeline with selected clips". This can be done in the Cut or Edit views.

There, deselect the use project settings and under Format set Mismatched Resolution to Scale Entire Image to Fit

Changing the speed / length of the clips

Because the delete gaps functionality only works for video clips and not images, this will not work after you change the time or framerate of the clips if you right click them.

You need to go to DaVinci Resolve in the top left (next to file) -> Preferences -> User -> Editing and change the standard still duration time.

Transitions

Select all the clips on the timeline (or at least two) and then Timeline -> Add Transition. You can see the available transitions by clicking the Effects button under the menu bar.

Cross dissolve is pretty good for timelapses.

You need to go to DaVinci Resolve in the top left (next to file) -> Preferences -> User -> Editing and change the standard transition duration time.

Delete Gaps

This option is really only for gaps between video clips, not audio or stills. You can find it under edit -> delete gaps

It still bugs out quite a bit though and can sometimes be invoked by creating a keyboard shortcut for it. To do this go to DaVinci Resolve (top left menu next to File) -> Keyboard Customization -> search for Gaps -> put <alt> + <delete> or <shift> + <backspace> behind Delete Gaps