Web pages of some of the people from who I learned something (not in any specific order) :

• David Roberts https://mathoverflow.net/users/4177/david-roberts
• Ben McKay https://mathoverflow.net/users/13268/ben-mckay
• Neil Strickland https://mathoverflow.net/users/10366/neil-strickland
• Todd Trimble https://mathoverflow.net/users/2926/todd-trimble
• Yves de Cornulier https://mathoverflow.net/users/14094/ycor
• Tobias Diez https://mathoverflow.net/users/17047/tobias-diez
• Denis Nardin https://mathoverflow.net/users/43054/denis-nardin
• Louis-Clément LEFÈVRE https://mathoverflow.net/users/79968/louis-clément-lefÈvre
• Dmitri Pavlov https://mathoverflow.net/users/402/dmitri-pavlov
• მამუკა ჯიბლაძე https://mathoverflow.net/users/41291/მამუკა-ჯიბლაძე