Your part is easy to draw with AutoCAD.

Here it is step by step.

First set your snap to something useful like 1mm. Type SNAP spacebar 1 spacebar
You are now working to a grid so everything is neat and tidy.

Useful Function keys are F8 which toggles Ortho and F9 which toggles SNAP

The spacebar repeats the last command. The ESCape key will unselect everything you have selected.

To select items pick them individually or drag a box around them. If you start dragging from left to right you get only items fully inside the box. If you start dragging right to left you select anything even partly inside the box. If you pick individual items but are only able to select one, type PICKADD spacebar ON spacebar

Draw the round ended slots horizontally. Put in a circle, select it, click Copy and copy it across to the other end. Watch the bottom of the screen, it will tell you how far you have gone. Draw a rectangle to get the two sides. Select all 3 components and click on Trim. Click the bits you don't want and they disappear.

Select all four components of the finished slot and click Copy. Stick copies wherever you want.

Add the circle. Click circle, the default is centre then radius. Click for the centre, type in the radius.

Add the 45 degree rectangle. Select everything so far. Click Rotate. When it asks for the basepoint type Center (American spelling) then click on the circle. Type -45 for the angle, AutoCAD defaults to counter clockwise so you put in negative angles if you want clockwise.

Draw the other rectangle.

Select both rectangles and use Trim to lose the bits you don't want.

Select both rectangles and type Explode so they become lines.

To radius the corners click Fillet
Tell it the corner radius is 8 by typing R spacebar 8 spacebar
Click any two lines and get the fillets.
Press the space bar to repeat the last command, no need to do the r 8 bit again.