There are two different ways to enter your hours:

You can switch between the two views in the 'Account' tab -> 'Work settings' section:

To start a timer, click the 'Start new' button. The timer will start running immediately, and you can click on the running log to add more details.

Click the '+ Add time log' button to enter time with all the details manually.

Here's how to enter or edit the duration or start and end time:

You can select the project for your log by clicking here:

After selecting the project, more entry fields will appear, such as the task field.

You can add notes and attachments to each of your logs:

If you need to enter a non-billable log on an otherwise billable project, this can be done by clicking here:

You can move between dates and add logs for past or future dates:

For the recurring entries, you can create Favourite logs so that you can add them to your day faster:

To delete a favourite log, click on the cog icon in the screenshot above.

In the weekly view you need to begin by adding a new row:

You need to select a Project for it first:

And then you can also select a task:

And add a row to your view:

Then you can simply input the hours under the correct days:

In this view, you can also add details to each entry. Here's how:

You can add notes and attachments:

If you need to enter a non-billable log on an otherwise billable project, this can be done by clicking here:

If you are working on the same projects and tasks every week, you can copy the list of projects and tasks from the previous week (without hours):