An easy way for sighted users to align tracks with each other is to use the Time Shift Tool which is located, by default, at the top of the Audiotikal screen in the Tools Toolbar
To use the Time Shift Tool, click on the button so it appears to be depressed, or press its shortcut F5. If you wish to change its shortcut to something other than F5, you can do so on the Keyboard tab of Preferences.
Then zoom in with Ctrl + 1 (or ⌘ + 1 on a Mac) so you can make a more precise alignment. Click in the track you want to move with the left button of the mouse, hold the button down while dragging the track to your required position, then release the mouse button.
There is no visual guesswork needed in aligning tracks as you can snap to track ends or labels when you time shift a track towards them. If you drag a selection region, the start point of the area on the time line is displayed dynamically, as a yellow vertical line, in the waveforms as you drag.
Some users find it easier to align tracks together when there is a vertical reference point extending down through all the tracks. You can make such a reference point by dragging the cursor down into the other tracks, and optionally by marking cursor positions with labels.
To drag the cursor into the other tracks, make sure you are using the Selection Tool (shortcut F1), and place your cursor at a point where you want to line up the tracks. Then hold down Shift on your keyboard and click in the Track Control Panels (where the mute/solo buttons are) of all your other tracks. Now you will see the cursor displayed in all the tracks, and you can switch to the Time Shift Tool and line up all the tracks against the cursor line.
To add a label at a cursor point, use Ctrl + B (or ⌘ + B on a Mac) instead. The label is created in a new Label Track underneath the audio tracks. When you click on the label, all tracks will be selected and the cursor will be displayed through all the tracks, just like when you selected all the tracks by clicking on their Track Control Panels. However the label provides a permanent reference point you can come back to, and because you can have multiple labels in a Label Track, there can be multiple points you can line up with.. You can use the shortcut