To combine several photos into one, you can use the following methods:

1. Use image editing software: Open image editing software (such as Adobe Photoshop, GIMP, etc.) and import each photo into the software one by one. Then, create a new blank canvas, drag each photo to the canvas according to the arrangement you want, and adjust their size, position and transparency to achieve the best effect. Finally, save the merged image.

2. Use collage applications: On smartphones, there are many collage applications to choose from. Download and install a collage application, and then follow the instructions of the application to select and arrange the photos to be collaged. Once completed, you can save the merged image.

3. Use online collage tools: On the Internet, there are some online collage tools available. Open the website of an online collage tool, upload photos to be collaged, and arrange them together according to the instructions of the tool. When finished, you can download the merged image.

no matter which method you use, you can adjust the size, position and transparency of the photos according to your personal needs and the functions of the software/application to get the best collage effect.